Answer:
It first helps to anticipate the problem if you do it will help you to either avoid it or confront it. Think about how you'll feel later if you go along with the crowd. If you've already made up your mind not to do something than be firm and show your conviction. Stand up for what you believe in! There's nothing wrong with that!
Ignore them. If they confront you, walk away. If they attack, fight back. If even the teachers are against you, change schools.