Why does this kids always stare at me?

Ok so I have "summer school" (ha ha yeah, that's what you get for not doing your homework >:P) and this kid, who is one grade lower than me stares at me all the time. (btw he stares at me on the bus) When I'm sitting up I quickly glimpse over to see if he looking at me and he is. So when ever he is staring at me, I duck down and hide behind the seat. And I'm just thinking "WTF, why is he staring at me!". I know I get attention from people easily. How? people say I act like a girl and sound like one. So pretty much they would ask, "are you gay?". I know for a fact that hes straight but hes always staring a me. Any reasons why hes stares me all the time?