I'm sorry you are having such a hard time. You seem to have a good handle on understanding yourself and your feelings, that's really good. I don't have a ton of answers for you, because I am full of problems too, but I can say I am really similar to you in that I am really nurturing and caring to my family, but they never seem to pick up on or understand my feelings. This exact same thing made me pretty much cut everyone out of my life-I have no friends whatsoever and I don't even try to get friends. I end up being too emotionally vulnerable and I resent the people who I have given so much of myself to.

Arg. Sorry, I just added instead of giving you any good ideas.
Just know you aren't alone.

Good luck.