Ok, so transsexuality has absolutely nothing to do with homosexuality, yet a person can for several years be 'confused' as to which of the two he belongs to?
Correct. Some trans people don't know they're trans, just like some gay people don't realize they're gay right away. I think a lot of trans people in this situation interpret their feelings as implying they are gay or just plain queer in some ineffable way. And it happens more often than you think, especially for late transitioners.
I can't find the source, but I read on another forum about a woman's person account in which, for a long time, she dated men prior to her transition. Although she readily labeled herself as a gay guy, she just didn't "click" with the gay community. She had this lifelong uncanny and unshakeable feeling of being an outsider, she envied the relationships straight women have with their boyfriends and husbands. It didn't occur to her until years later that she was transgender -- maybe she'd never heard of the term, maybe she never thought
she could be transgender (it only happens to
other people, right?
right?), maybe she thought all other gay men had the curious feeling of being a straight woman too. Whatever the case, the realization made sense of a lifetime of sense.
I have a friend who has a similar experience: before transitioning, she dated women. She had the bizarre an inexplicable feeling of being gay, even though everyone around her would describe her as a vanilla straight guy. She asked herself, "how the hell could I be gay, I like
girls!" She didn't fit in with gay guys, she couldn't relate to straight guys -- strangely enough, she found herself drawn more and more into lesbian communities, particularly the autostraddle community, and found her other transgender lesbians as well. No surprise she couldn't relate to straight guys, but she was neither straight nor a guy. She found a tremendous amount of comfort that there were other similarly situated people, though it took her a few more years before she was comfortable and financially prepared to make the transition
Read about Chaz Bono, I think his experiences are very very similar to the ones above.