im 15m and my crush is 15f i rlly need help

I have had a crush on her for 4 yrs i havent even talked to her in like two yrs she is only in one of my classes idk what i should do? I dont think she knows i like her but she might. I just dont know what to do i rlly like her and im just tired of waiting. Should i talk to her or try to forget about her?

Should i talk to her? plz i need help