I am incredibly interested in gender studies and the like, but I go by 'female'. Language is very complicated and I have a hard time thinking of anything else I'd like to go by, particularly when it comes to pronouns. I'm a her/she, mostly because its easy. If I could think of an easy alternative, I'd probably accept that. My gender, although a part of me, does not define me. It doesn't -mean- anything to me. It means I can carry children (though I won't) and that I have a monthly period. That's about it. Its a biological term for the way my body looks and works.
There was a little girl at the nursery school where I worked who often was called a 'he' by other students because she had short hair. One day she turned to them and laughed and said: 'You think I'm a boy. Because I have short hair'. I think that identifying someone by how they look is sort of strange and archaic, but its a hard thing to get out of. I mean, we still have male/female bathrooms, for heaven's sakes. (Though I once saw a photo of a bathroom somewhere that featured a gender neutral bathroom area, and that was awesome).
I mostly think: Be whatever you want to be and do whatever you want to do. She/He/It? They are words. You aren't words. You are a human being, and honestly, what you 'are' beyond that doesn't matter one bit.