Well, that depends on you. Some people figure it out when they're in their teens, when they're young adults, and some even when they were little. Sometimes it's a process of understanding and figuring yourself out.
Sexuality is actually pretty complex for some people. wewe could be a grey-a asexual who's attracted to woman, wewe could be a gay man who's attracted to transmen, wewe can be a lesbian and only be attracted to women, it's all narrowed down to personal preference. All I can say is, you'll know one day.
I'm still figuring things out myself. I consider myself a grey-a pansexual, (grey-a: not as sexually influenced as others, but not completely repulsed kwa sex. pansexual: attracted to personality zaidi than gender)- however, I'm discovering that I might be zaidi into girls. A lot more. But I have identity issues, and my tastes and maoni change rapidly at times, so I'm afraid to call myself anything else.
i think sexuality just grows on us as we grow up, maybe we are always changing, maybe someone may have a gay phase one siku and then be attracted to a woman and marry her, au something like that, i think it may be biological for some people but im not counting on it. I don't know how wewe know if your gay, lesbian au bi, because i don't know what i am, i think most people have a little bit of everything in them, and then when they get older, some people might have a little zaidi of something than something else like, a little zaidi gay than straight au straight than gay au bi au something, and yeah i guess some people might have zaidi girlish genes au manly genes, but i don't think that has much to do with it, i think upendo has zaidi to do with it but im not sure
