So theres this girl

So theres this one girl i hella like. We've gotten to be really good friends and stuff and i wanna tell her about how i feel about her. She doesnt have a boyfrend right now becuz her last one was a dick and used to be abusive. Not sure what to do.. i dont want her to turn me down cuz then after that shit would be so akward and weird. What do i do? What do i tell her? Should i tell her at all?

Btw Im 15 bout to be 16 and a sophmore in high school and so is she (just so you can get a feel for my situation)