I Need Advice From Any Openly LGBT Person

So I'm beginning to realize that I like girls, or at least I think so. I've never actually had a crush before? I've always been really closed off about relationships. I've always just thought there's no point in having a crush because I can't act on it, I'm too young to date. Now I'm starting to reconsider. I know looking back that I've never had feelings for guys but girls are actually really cute and I think I like them but also I've never had one particular girl where I was just like yes that girl, that girl right there, I really like her! Maybe that's just because I never really let myself though? Also I really like the idea of having a girlfriend but I still don't really have any particular girl I'd like to date. Even if I did how would I know if she likes girls or not? I'm definitely too young to use a dating app but it seems like that's the only way to find sapphic girls. What do I do? I'm so confused by my feelings.