What to do when a couple friends keep cutting me down?

im a sopre girl in high school and i have a couple girlfriends who think its fun to make fun of me. They'll say things like "you dont have " or if im just being myself they'll say things like "you're not normal" or "you need help" and think its hilarious. they do it a couple times almost every day, and i dont care if theyre just joking, because it really hurts. I always seem to be the of all their jokes. But if i tell them it hurts theyll just make fun of me more and tell me they were joking and to quit being so oversensitive. am i really being that oversensitive? should i just deal with it? or should i find new friends? help!