[MENTION=9811]Thestralis[/MENTION]
What does good is for me to understand that they are in trouble, and to act on that understanding in accordance with my personal values and practical considerations to offer what help I can. I suppose this ties into what the OP called compassion, but I always considered compassion just a feeling or attitude, meaning it did not imply or require action.
Now that you say this I have to think about something. In some way I do believe that most humans act out of 'egoism'. And egoism has a bad connotation to it but it's not negative per se.
When I help someone, I also do it because it makes
me feel good. People might start to like you when you help them, when you listen to their problems, if I don't help them I might feel guilty so I'll avoid that feeling by helping them, it makes me believe that I am a good person, that I'm doing something good, that I'm making myself useful etc,... Humans developed empathy because we needed it to survive. I think that needing others to survive and being 'kind'/helpful because of that isn't selfless at all. (One of my teachers once used this as an explanation for why we can be 'altruistic'. I believe it proves the complete opposite, it's only for our own use)
This does not mean that each time when I help someone I'll think about how good it makes me feel or how thankful they should be. But if I look deeper into it I can't deny that there's also some 'gain' for me, the act of helping someone is not completely selfless. Even when it's out of 'compassion'. (Which brings me to another point; when you help someone, most of the time you expect the other person to be thankful for your help. This sometimes creates inequality between two parties. The 'mighty' helper and the 'poor starving lamb with four broken legs'. And this is also one of the reasons why I think that people can never be truly altruistic. I've seen the 'sweetest' people with 'the best' intentions turn into absolute douchebags because someone wasn't showing enough respect/gratefulness for their unwanted help/support.)
I believe that if we didn't experience positive reinforcements (as in; thank you, gratefulness, a good image, connection, friendship,...) or negative consequences (feeling guilty for not helping someone, shame, being perceived as a bad person) that people wouldn't be that helpful at all. (But good, maybe this is kinda off topic because helpfulness isn't the same as being empathic.)
And I don't think that this is a bad thing, it's just how people are. But because this sounds so negative, people prefer to give words to it like 'compassion' as if the only reason why you're helping someone is because you're such a selfless person.
Many people see 'pleasers' as people who are selfless, or I've heard many people say this at least. And from what I've noticed are pleasers perceived by other people as both good and weak (not sayin that I think that they are weak). I think you could also see them as people who just don't respect their own boundaries, or who are not able to respect their own boundaries due to fear par example. They are not selfless, they probably feel immense guilt when they have to 'let someone down'. But that definitely doesn't make them selfless or more empathic than average. People who always want to please someone definitely have some underlying issues. (Maybe this sound kind of negative or denigratory towards people who are pleasers. I don't mean it like that in any way) I think that society 'praises' pleasers way too much, even though it's unhealthy and they actually suffer from being a pleaser.
[MENTION=14857]Ravenetta[/MENTION], beautiful post.

I can't respond to everything since it's kinda long (and my post is becoming long too already) but I definitely appreciate what you wrote. I might respond to some things later on, for now I picked one statement out of it.
I would say that I try to maintain respect for NOT assuming that I feel everything they are feeling. I would never ever say to someone "I know what you are feeling".
I personally agree with this, in a way that this is how I like to be treated.
Though I think there are some side notes.
I once had a conversation about this with my ex. I think I was talking about depression and she said something like "But many people go through that". It's not the only thing she said of course, but it annoyed me and it definitely didn't make me feel better. So I decided to tell her so, that I didn't like it to get compared to other people, or that the fact that others felt that way too didn't make me feel better. That it rather made me feel as if my story/feelings was/are insignificant.
She then explained to me how she viewed it and why. Her therapist always told her this, that she wasn't the only one with these problems. And for her personally, it was helpful. It made her feel better to know that she wasn't the only one who was going through something like that. That's why she thought that it would also be helpful to me. She then understood that I didn't perceive it like that. And I understood why she would say something like that.
Though I would say that she's a pretty emotional empathic person, much more than me. But the way she showed it didn't really 'match' her empathy level. What could also explain why people who are emotionally empathic do sometimes say 'stupid' things. Everyone has a different perception of how to be helpful, and what we perceive as helpful advice (though, giving advice isn't always useful).
Maybe this is how you could divide empathy in 'levels' like IQ or EQ. Someone 'score' can be very high on the feeling part, but not all too high on giving advice or giving a meaningful, helpful response (cognitive empathy).
Or a simple explanation could just be that many people tread others the way they like to be treated themselves. Without considering if the other person indeed likes it to be treated that way.
(And please, take this post with a grain of salt -or a whole bag-. These are just some random thoughts, how I think about it
at this moment, not necessarily 'the truth' or how I think it should be)
[MENTION=35566]Luminous[/MENTION]
If I'm around someone who is negative nearly all the time, it's completely and totally exhausting to me. I really just can't do it.
What's the cause of the exhaustion? The most obvious explanation (to me) would be that it's because you feel the negative emotions of the other person. Is that correct or is there another explanation for it?
If it's correct; this is something I can't relate to but I think it's a beautiful quality in some way (though it sucks too). And I also think it's interesting because I don't experience it like that.

I can imagine getting exhausted, I get exhausted too when I am around others but not for the same reason as you do I think. And some people are indeed more draining than others.
I'm not sure how to answer the 'how' question. Feelings happen.
The how question is more in a way like; how do you physically feel it. I honestly don't know how to answer this question myself so don't worry about it.
I was picturing it in this way more or less; one of your friends is crying. You know how it feels to be sad, the way your body feels when you cry (maybe you get headaches, your chest hurts, your throat becomes sore, you might start sweating,... it's different for everyone). Do you experience those physical feelings too when someone else is crying?
[MENTION=16650]Maya Dawn[/MENTION] & [MENTION=35566]Luminous[/MENTION]. Thank you, that's very comforting to hear.
I have an additional question: Would y'all rather have a different amount of empathy than you currently experience? Would it be better? Make you happier?
Interesting question.
Sometimes I think that my lack of emotional empathy makes it hard for me to connect with people, or to 'live in the present', with others and not just me existing with others around me. Or I feel weird/guilty for not feeling anything while they are hurting. I don't think that I feel nothing at all, but it's not intense and I can easily shake it off. I can't 'pin point' what I exactly feel, it's shallow. Or also on the positive side; when someone else is happy. Yeah, I will 'feel happy' for them but I won't experience their joy as someone with a high empathy level would, I think. (I honestly don't know anymore, I think I can genuinely feel happy when someone else is too? It depends on my own mood. And for someone with a high emotional empathy level, this wouldn't depend upon their mood I think)
An example from when I was visiting a hospital with school, a place where I could possibly do my internship. There were many kids/people who were extremely ill. It wasn't sure if they would survive their illness. Our purpose would be to make their stay in the hospital as comfortable and enriching as possible (doing activities with them, talking,...). After our visit the teacher asked us what we thought about it and how we felt.
I had to answer this question first, my response was that I thought it was very interesting and that it could be a place where I could learn a lot (about their illnesses etc). While everyone else started to talk about how it touched them emotionally...
I didn't feel that. Yes, it sucks for them to be in that position, but I don't feel it. I remember this one person in the 'creativity room', they were completely bald, sitting in a wheelchair with all those tubes (?) attached to them. They were interacting with their supervisor (?) and they genuinely seemed happy. That stayed with me for some reason because there just was something about the whole atmosphere. It's a shitty place to be, but seeing how that person was still able to laugh made me feel something. Not sad, or happy, just something.
But I didn't feel bad for the two/four year olds who were incredibly sick too. I can recognize that it's hard to deal with, but I would be lying if I said that it touched me. But if I would've said this to my teacher, in class, I would probably be perceived as a person without a heart.
On the other side I believe that it gives me the ability to deal with 'harder' stuff. A friend of mine once went through a hard breakup and even though I really wasn't feeling all too great I was able to put my feelings 'aside' to help her. She was suicidal, and I was too. One part of me felt as if I was lying; who am I to talk about this? I didn't even believe that it would get better either, that it's worth being alive. Deep down I even agreed with her, this place sucks, let's die. But I mean, you can't tell someone that it's totally okay to just fucking die. And I didn't want to let her down because I knew that she trusted me and that I made her feel understood, we've always had this mutual understanding.
It was pretty hard at first, 'getting over' my own shit to help her, or to put things into words without dragging her down. Since I still wanted to be honest about how I felt about it, so we could share our feelings, to create mutual understanding. There was a sense of connection, but emotionally? In some way maybe, I don't know for sure.
Even though it was pretty heavy, it never drained me (it actually made me feel 'better' in some way, since I had to lift myself up too, and I was able to connect with her again, with our shitty thoughts and feelings, we're in this shit together, ey!). And even though I knew how it felt to be suicidal (I mean, I was feeling it back then too xd), I didn't feel bad for her. Yes, I was worried when she didn't respond for a while anymore when one of her last text messages was that she was just driving around and that she didn't know were she was. I felt bad for her in a way that it just sucked that she wasn't able to see her own worth, that she's actually so damn smart but that mental illness has got the best of her,... But it didn't hurt me emotionally. I could say that I felt something, but it wasn't intense.
The positive thing is that I won't 'break' under it, it was hard, but not too much to handle on an emotional level because I just don't feel it like that. I slightly remember feeling bad, being worried, I thought about her a lot, but not as intense as how I would feel when I am really sad. (Though I now remember something someone once told me that really touched me. So yes, I sometimes do have stronger emotional responses but I tend to forget about it. This is also why I might believe from time to time that I'm completely emotionless while that's not -always- the case)
I think that if I would've become (too) emotional that this could've been another story. I can imagine that if someone would become extremely worried, sad, anxious, hurt,... That it could break them up.
But okay, to actually answer your question; yes and no.
I also invite you to answer your own question, Luminous.
Edit; Jezus crap. I suck at keeping my posts short. I should work at that. :')