I need help with boys!! PLEASE READ!!!

I have this guy I've been interested in for about 4 mouths now. I've stated having crushes since I was like 9-10 a normal age I think to start to feel a certain way about a boy(I'm 13 now) but I've never had a crush like this. I'm have a class with him were we sit back to back and he always lays on me and has complemented me a couple times before and I feel butterflies in my stomach and a pounding in my chest every time I see him . I don't know what to do because I tell my friends and they don't know what to say (we have a group of friends and they all know but him so they try to help me) because he have a crush on an 8th grader.
I'm fm along but I need help how can I appear dateable him or how can I get over him because if we can't bee together I want am to stay his friend because I Enjoy his conpany.