School is tough and from my experience, most oter people in the world are arseholes. At my school I had to put up with every little gobshite who though he was hard or "gangsta." My technique was just to piss them off by being different. I have fairly long hair, which got me teased but I just ignored them which proved that I wasnt afraid. It's no fun to tease someone who doesn't care.
I know its hard but stick at it and you can get these guys off your back.