Help!? (details inside)?

The past 2 days, the people that I am sort of cool with, but not really friends with, they always tease me about being big or fat or say some stuff about me being fat. So today in school we had an embly. They happened to sit behind me and kept messing around. One kept lightly slaping my neck and the other kept messing with my shirt tag. So going back to cl they was like "LETS GO THEN" wanting to play around so I punched him so hard in the chest and then was like "DONT CRY" and then laughed. Then afterwards, he goes, " I DONT LIKE YOU, YOU HIT ME, GET AWAY!" so then im like "c'mon dont be that soft, I barely touched you". He wasnt playing about what he said. There always talking about me or seem infatuated with me because I wear nice "GEAR". But when someone walks up to them and starts dissin them, they get scared and dont say nothing. THen when the person walks away they talk about them for like 5 mins after lol.