Ah, here we see the ENFJ paradox -- instinctively driven to help/fuse/connect, but the least able to sustain that level of deep empathic connection without incurring damage. I don't know where I'd be without my support structure. Probably a lunatic. Psychology is an excellent field for you, yes, if you can find some method of removal from your subject. If you figure out a way, PLEASE don't hesitate to let me know. I'd like to try it.
This is why it took me so very long to finally decide on being a psychologist. I had such a rough time knowing that it's required to keep a certain distance from your patient. I kept telling myself "..but the way I make people feel better is by sympathizing! By empathizing! By showing them they're not alone! By creating a real connection and being there for them!"
But I came to wholeheartedly accept it, because what I eventually realized (coming in the guise of "rescue" relationships) is how DANGEROUS and HURTFUL it can be..not to you, but to the other person! Sure, you can feel their pain, you might be able to use your talents to be able to see how to work a way out of it.. but it's ultimately their life. You can see through their eyes, but they probably don't have the talent to see through yours and understand why what you're saying is best.. IF it even is FOR THEM. Who are you really to say what's right for anyone but yourself, even if you can venture a guess using their data that's probably correct? Either way, it's not your choice to make. Your job is not to heal their hurts, but to guide them in finding their own personal methods to heal themselves. So that disconnection is NECESSARY in order to do any good, and intruding on their mind, risking projection, and telling them how to live their life is only going to upset them. Even if they do listen, it will create co-dependency. Making that connection makes them feel better because they feed off of your loving energy. This is somewhat okay for building trust and mutuality for friends or family who you plan on having in your life, but detrimental for someone you're just trying to help. Getting into that mindset is a good motivating point towards convincing yourself to disconnect. It takes a LOT of Te.
A nice, personal method.. is just to switch your thinking around. No matter how bad that person seems to have it.. start thinking in terms of what lesson could be learned. Finding the silver lining. Remind yourself that this is a person, living their own life, making their own choices. Not you. Picture them making choices to better their situation, learning to grow on their own, having a support structure they could turn to already, if they so choose. Once you can find an ounce of joy for them, you won't feel that urge to fuse as much. You know deep inside they don't really need
you.
Also.. though you feel the urge to fuse with everyone, remember that the more people you try to help, the thinner you're going to spread yourself, and the less good you're really going to be able to do. Just remember, you can't please everyone, nor is it your responsibility to. Picking and choosing your battles is the most helpful way of achieving anything.
I've still found reminding myself how hurtful it can be to assume the position of someone else without knowing a whole lot about them already the biggest way of keeping my distance. Knowing I will probably do more harm than good either by mis-information or by not having the time or energy to really make a difference overpowers that initial instinct. And then sometimes it leads into nice, casual conversation that either allows them to vent and feel better, or can bring them to some conclusions of their own naturally. It's a cool thing.
And again, that's not to say that means to ignore everyone! Just making a short eye contact connection and smiling at someone, or offering a small piece of advice can make a big difference, but when it comes to the deep connections, it's not always a good idea. And I only offer this line of thinking for someone to use once they deem it necessary to keep their distance, not necessarily to live by.
