How you became gay? Alot of gays said to me they were .....
You sound like you just discovered homosexuality exists and that since you just found out about it, it must be something very new. It's not.
Researchers have been studying what makes someone gay for 70-80 years now, if not longer. There were lots of theories back in the 1950s and 1960s about the type of relationship with your father, or your mother, or being molested, and none of them held up.
First, being gay is not defined by who you have sex with, but who you're attracted to. You can be gay and still be a virgin. I was attracted to other boys at age 7, but I didn't have sex with anyone until I was 20.
Second, sexual orientation is not a binary thing, 0 or 1. Sexual orientation is a spectrum, let's say 0 to 6, and people can fall anywhere along that spectrum. People at either end of the spectrum would find it impossible to be attracted to or fall in love with someone of a gender that didn't match their orientation. People in the middle of the spectrum might be able to fall in love with someone of either gender, and they can choose to limit themselves to one group or another. But no one can choose who they're attracted to, or who they can fall in love with.