Who you hang out with does not have any bearing on ones sexuality. It is who you want to jump into the sack with that does.
You’re confusing the two.
There is no proof homosexuality is biological in origin. If that were true, there would be no switching from homosexuality to heterosexuality (and vice versa).
It appears that human sexuality is very flexible, and that instead of the “I was born this way” it is “I can’t help that I feel this way”. In other words, a personality disorder.