AITA for knocking a kid out

for context this story has me (14m) the person i knocked out(15)m let’s call him owen (that is not his real name) and a group of people (age ranges from 15-18) so this has been going on since of the school year. so owen and this group of people have been constantly harassing me calling me names, pushing me in the halls, taking videos of me and posting them online shit talking me, and trying to jump me. one thing they have done that pushed me over the edge was say “oh you see that little emo princess over there yeah he abused his ex” which i didn’t. so when owen came up to me and said that at lunch time i told him to fight me which he did and i knocked him out. other people from the group (a few 16 year olds and a one 18 year old) have tried jumping me and lost but everyone at my school is calling me the asshole so i would like to get other peoples opinions (sorry for any bad grammar or spelling once again i am only 14)