I think i have bullying problem?

At the beginning of last year, one of my friends, started to slap me for no reason and i would slap him to sometimes but not that much. It wasn't meant to be mean he though i didn't care, and i didn't that much at first but then all these other kids thought it was ok to slap me to. After a few months i final got him ot stop but getting everyone else to stop was another thing. by the end of last year i got most kids to stop except a few people who really don't like me for no reason. I have never done anything to them they just don't like me i don;t know why. These r mostly the cool kids, tis like 4 kids mainly. So for so long all these kids have slapped me and also insulted me made fun of me, one hting that really pisses me off the most is when i do things sometimes they say just smack him. Aa if i do something they don't like they can just hit my and i'll stop i really hate that. This year there not ny better. Three of the kids are not that bad really one just tel me to shut up and get angry at me even when i'm not talking to him he'll just be like oh my god i swear to god shut up or i'll do whatever. i don't get why he has a problem with me. Another one is always insulting me on what ever i say. If i say something he'll just insult me for no reason. Another is not to bad he slaps me sometimes and then pretend like were friends sort of at other times more like neutral not friends. The last one is the worst, he slaps me like at least every other day and just tells me to shut up and insults me. today he i got in to a fight with the worst one and he said like you wanna go you wanna fight, and i said i don't wanna get in trouble. he and one of the other mean guys are best friends so they said i was like a wimp. so me and the worst guy started pushing each to her and got into like real pushing and slapping fight no punches really. eventually he just walked away and other split us up sort of and it ended. later he was telling people that like i fought him for no reason and i was the bad guy. that pissed me off he's been pushing me around for like 2 years. this guy i pro bally could beat up if i wanted. should i fight him again, because he won't stop picking on me, or should i apologize and say like let not be enemies. this might make him pick on me less or he'll thunk i'm weak or something. so should i fight hm again or apologized and try to become neutral. fighting was hard for me because i'm a very gentle person normal but he made me so angry. i 'm really not sure what i'm asking i just have to tell someone about this im so angry i don't know what to do help