And after I get done explaining how terrible the teacher was, thinking that my mom is actually interested 1, she tells me that she was thinking about getting some depression medication for me, 2, 3 and told me that it's not normal to get so upset over things 1,2,4
I don't know about you, but your mother's reactions betray in her:
1) A complete lack of empathy.
2) Denial/repression of negative emotions in self.
3) Controling of others, tries to deal with emotional challenges by taking
direct practical action to eliminate them.
4) A highly externalised valuing process, driven by superego/self-concept, call it what you will - references her mistaken perception of what is socially valid behaviour to an imaginary norm which more likely has its roots in what she expects/has been taught to expect of herself.
She comes accross as being a not particularly rounded or well developed -STJ, certainly --TJ type on the basis of this conversation, and this is a type that INFPs may be expected to have difficulty relating to in general due to their very different cognitive styles. It also sounds as though she has the potential to be quite an overbearing personality, at least to you, and that this is affecting your confidence enough that you are questioning your own perceptions and the validity of your own judgements. I think having different personal values to those around you is indeed entirely normal for an INFP - it's a function of their dominant Fi process which is highly subjective and does not look to others for validation. Most INFPs will spend time during their lives being troubled by the conflict between what they feel and what those around them appear to be feeling.
It does not help that denial or repression of difficult feelings is not really an option for INFPs who are constantly aware of them, or that their typically high degree of empathy and idealism *hey, they're not called "idealists" for nothing!* makes it diffcult for them to cope emotionally when they are in conflict with someone who does not share their personal values, particularly when that person is someone they care about. You can't help the way you feel about things, but you can choose how you deal with them, and on this evidence your mother is probably not a particularly good person to turn to to look for emotional support when something is bothering you. Her qualification in psychology is not something that gives her understanding of your emotional state any more credence when she is already demonstrating a lack of empathy and insight into the human condition. I would personally recommend:
1) Trying to find someone else who can provide the non-judgemental listening and empathy that you appear to be craving. If this is her typical reaction I don't think you will get it from her.
2) Developing your own confidence and assertiveness skills, especially when dealing with her. It sounds like if you come across as vulnerable or weak she will take a highly parental role and try to impose herself on you in the belief that she knows better.
3) Try to spend more time talking with people who are more open minded, less judgemental, and have greater insight into the human condition. Perhaps you might find some on here!