Right so I don't know if anyone will see this but if anyone does I'm really desperate for advice.

I'm 15 year old female and I've been really nervous because I started to think I might be lesbian, I have a crush on my best friend but I can't tell her,

She told me before everything between us is platonic and I'm not sure who to go to for advice since I'm not close enough with anyone from my friend group to say anything,

I have quite deep feelings for her and I've researched online thing like, is it weird to be jealous of your best friend, is is weird to have a crush on your best friend, how to tell if your lesbian, what to do if your lesbian, ect

I'm really afraid and have no idea what to do, it's wrong whenever I get jealous of her and i don't know how to tell her how I feel and if it's too soon since she's enjoying being single (she broke up with her girlfriend in march), can anyone help me with this?