It's one of the hardest lessons to learn when growing up, that someone you really like just doesn;t feel the same way about you.
Hard though it is, you have to accept that there is no future in feeling a lot for this boy.
The way to get over it is to spend as much time with your friends as you can - go out in groups, have a good time, enjoy yourself.
It will be hard ar first, but your feelings for this boy will pass, and you will meet someone else who likes you too.
I know that sounds impossible now, but trust me, this is how growing up works - feelings are wonderful, but they dont always tickle!!