No one can tell Du if Du are a lesbian. Only Du can tell. Don't let anyone try to convince Du otherwise. There are no "gay quizzes" oder tests that can tell for you. I wrote an Artikel about this that may help you:
link I know, it's really hard to tell. I think it's easier for guys to tell if they are gay because they tend to experiement more. But Du don't need to experiment in order to tell, and I wouldn't reccommend sleeping around.
After Du find out, Du may want to keep it to yourself oder come out of the closet to family and friends. But DO NOT do this if your family might kick Du out (unless Du have a place to go). Du might want to get a girlfriend oder just stay single for a while. It's all up to you.
Don't try to change yourself. There are no "gay to straight" programs that work, and there never have been. God made Du the way He meant to, and He loves Du no matter what.
