first... get some help, and no, I'm NOT calling you crazy. First, please read this:
http://en.wikipedia.org/wiki/Transsexualism and read the articles related, so you can get some extra information... It's not gonna be as easy as you think.
Think about it carefully, go to your local LGBT meetings, meet transgendered people, get to know how things are, and IF YOU, read carefully, YOU still want to, SEE A MEDIC FIRST!!! Please!
Self medication can kill you, playing with such medicines is quite dangerous, since your body chemistry could change in a negative way.
Please, DO NOT ignore this post.
Good luck to you in this journey and best wishes, it's gonna be quite hard but, listen to your heart, and if it's what you want, go for it
