I would also like to add a positive comment to give you support.
One of my closest friends came out as transexual not too long ago, and he was incredibly nervous at first. Currently only about three people know, but I try to be as supportive as possible. As of now I don't understand how his process worked or how he came to the conclusion that he probably was a she instead, but as a friend I try to show support and understadning.
I say that if your parents don't understand, if your friends don't understand - then that's their goddamn problem and their loss. I know it hurts having to lose people in your life just because you want to be who you are, but if they can't adapt or throw tired clichés at you, then you should mourn their loss and move on. Find new friends, find new extended family.
Take care, and be strong!