I always cringe when I hear someone say something like, "Do you think I would have chosen this if I could?" It smacks of "I'm a victim. I'm afflicted. Feel sorry for me." It implies that there is something inherently wrong with homosexuality, when the reality is that there is actually something wrong -- terribly wrong -- with the bigots who dehumanize LGBT people.
I get it, though. When I first came out of the closet, I thought that way, too. As I got older, though, I realized that choice is irrelevant with regard to the question of whether or not LGBT people must be afforded the same rights that everyone else enjoys. We must, period. That is the only just, morally-correct answer.
I can't remember where, but I heard/read this quote not too long ago: (paraphrasing) "It's funny how the people who claim that being gay is a choice are always the ones who don't actually make that choice."
Personally, I believe its not a choice. I've never been attracted to women -- not once, even slightly. There was a time in high school when I tried, very hard, to convince myself that I *was* attracted to women, but it was rather like writing with my left hand; I could sort-of do it, if I concentrated really, really hard, but the results were never as good as they were when I wrote with my right hand. Thankfully, I realized after not too long that the whole exercise was silly. Why write terribly with my left hand when I can write beautifully, effortlessly with my right?
I'll say this, though: after experiencing life freely as a gay man, If I could choose, I'd choose to be gay.