Dear Andy,
I think I know how you feel. It is hard to explain these feelings. I just posted for some help with my own feelings. I have never had sex with a female at all, I use to think when I would see females and find them attractive I was straight, but what I was really attracted to was being like them myself. I have crossdressed and masturbated with the image of having sex with a man.
There is a part of me that knows it would feel so right to have sexual relations with a man as a woman,let me know if these are feelings you have had.matty