Ok so im in high school and i haven't had my first real boyfriend yet and i will be 15 in like 4 1/2 weeks. ?

i do like this guy in my homeroom but i don't think he likes me back. When i see him in the hall he does look at me and give me a motion of "hi"(like a nod or a smile) and we do talk and he seems to be flirting but form what i hear he likes someone else (a friend of mine who's friends with him) but i don't know if the guy i like would tell him, because he could tell me (well you know how that can be) but i don't know if he likes me or if hes just toying with me.please tell me if you think he likes me and how i can win him over.