If I were you, I would try to make friends.
You must take care of your look and personal hygiene.
You must be friendlier when you talk with your classmates
If you practise a sport, you will have more friends.
If you are being bullied, you musn't bully the bully or other people because the violence is never the solution.
If you are being bully you could talk with your parents and teachers because they can help you with your problems and they can convince your classmates for stop bully you.