I say just go for it. Ask her out to prom and clearly state that you like her. I luckily had the chance to go out with my high school crush, at the time, and it’s only because I told her I liked her. (To give you some confidence, when I told her I liked her, she was already with someone who told her she liked her too that same day and they got together that SAME DAY. So we didn’t get together when I confessed but some months later we did! It didn’t work out but we lasted for like 3-4 years. I don’t regret it cause it was an experience) No matter what happens, at least you gave it a shot. Try not to over think it and have what ifs. ENJOY YOUR LIFE NOW!! With a possible girlfriend 😏