It's not a proven fact, so yes it's clear that your post was an opinion. And you're nitpicking. You say environment shapes a person's sexuality, which, it could influence it, but ultimately does not make the decision. Just like you don't choose whether you're white, black, Asian, and so on. You can only pretend to be something for so long until you're forced to face the truth.
Yeha of course it was an opinion. How should I clearly know why someone goes gay or lesbian? I'm not a scientist or something like that hahah XD
... but that's no argument. I mean you can't choose you skin or your culture, sure, but you can't say that youre forced to face the truth to be someone you might think you are. Just three little examples. Same place but other background.
Ex.1) You're born as
(boy) on a island with only mens.
Ex.2) You're born as
(girl) on island with only ladys.
Ex.3) You're twins. (Boy and Girl) on a island with men and ladys.
I would
bet that the first one would be gay, the second one a lesbian and the last one isn't sure. Like i said development but also you're not born and your destiny whatever it is, is decided. I mean if you really think so, then sit and wait.