Being a gay male trapped inside a woman's body is completely plausible, even if you would be a huge anomaly. But the questioned has to be asked if you have always felt more like a man than a woman, in both a physical and an emotional sense. Transexuals generally feel like they've never fit into their own body. It should have been noticeable since you were quite young if this was the case however i'm not ruling anything out. The gay members of society, including myself have always felt different than other members of their own gender but usually feel at home in their body. Their feeling of social awkwardness usually is related to not fitting into acceptable gender roles and interests, and of course their sexual attraction to the same sex, which may or may not become realised a bit later in the piece.
The thing to remember is that unless you are an absolute complete arsehole, you will no doubt always have friends where ever you go, if you make the effort. There are always going to be people who accept you for who are, and 9 times out of 10 these will be the friends you would rather have anyway, as opposed to those will turn their back on you for a simple gender identity crisis.