i know exactly how you feel.
the best thing to do is talk to people, maybe not your friends because they might give you the wrong thing you want to here , but someone older , like a sibling cousin parent anyone.
make sure you dont bottle it up because that is the worst thing possible and creates more problems.
You will eventually get over it , as it might take a while, you have to do things to occupy yourself.
hang out with friends more , do things that ur good at and that will distract yourself.
Try to have a positive mind , like " it will get better down the track" , and " i dont need a girl to bring me down".
It is obviously hard to try to think positive but thinking negative will make things worse...
also look things up on the internet in books of how you can help yourself if you dont know what to do
its easier said than done but hopefully this helps a little.