Hmm... I know how we feel inside can vastly differ from what we portray to the world, but I never thought of you as a peg that doesn't fit. I think you fit in perfectly fine - at least with us.
I do hear what you're saying, though. It's hard to find that place where we belong. I think the first key (at least this is what I've been trying to tell myself) is to belong to myself. Does that make any sense? Sounds kind of hokey when I say it out loud, but the biggest challenge I face is accepting myself. When I don't accept myself, it feels like others don't accept me, and that's at the heart of every single one of my self doubts.
I can't tell you to believe in yourself, but you should. You're a wonderful, loving girl who maybe is just a bit lost right now.
*hugs*