How to get a boy?

So I have a decently good body and I’m confident and all until someone with a Y chromosome comes near me. Specifically this kid named Mike.

I know he likes ass and Ik I got one but idk how to get him to notice and wanna have sex with me. My friends tell me to just be like “hey I like you. Let’s have sex” but the thing is I have NOOO confidence in that way. I get really nervous and flushed around him. I really like him and thinks he’s bf material and def fwb material if plan a (bf) doesn’t work