I NEED HELP GUYS

I think I might be bi please can someone help me understand

I’m only 15 so still not fully understanding everything about sexuality and specifically what it means to be bisexual but I’m starting to think that perhaps I could be.

A few years ago one of my ex bsfs and I shared a kiss that we both shockingly liked and soon after I went to sleep stressing that maybe I was in fact a lesbian. After a while I brushed it off and just presumed it was teenage experiments and I mostly forgot about the whole ordeal.

However, there’s a girl at my school who’s also bisexual and I’ve never thought I was interested in her because I was ‘straight’ wasn’t I? Anyway, about a week or so ago I started looking for her in crowded rooms and finding excuses to see and talk to her, I even went bought her a bracelet from my most recent holiday so perhaps I have been feeling this way for longer than I realised.

I’m not really sure if I have legitimate feelings for her or if maybe it’s out of boredom and even if I did I don’t know if that puts me as bisexual or if I have to be completely interested in loads of girls to be considered this way.

However, this girl has a massive crush on another girl who doesn’t like her back at all and even though I keep trying to flirt with her I’m pretty sure she doesn’t see me this way, I guess I just want an outside option if I seem as though I have genuine feelings for her and if I could possibly be bisexual.

Thank you 🫶🏼🫶🏼🫶🏼