I like him but idk if he likes me?

I luv dis guy in homeroom but he doesnt like me. at least i dont think he does.were like bffls lol but hes gone out with this one girl that I HATE and shes skinner popularer and more his lenth in size then i am(he shorter than me but shes the same size) but im a lil afraid that he only likes me as a friend and thtt he likes THEM type of girls. but i really like him and want to find out if he likes me or try to make him like me if he doesnt like me.what should i do?