i cant stop treating ppl bad even tho ik im. a good person

i keep on like hurting ppl i love and idk y i am the way i am anymore like i hurt so many girls in the past and idk what to do my dad was the same way and evrytime i hurt somone i realizes that i hurt them and i feel like shit n i ja wanna be a good person but i messed up so much times idek if thats possible anymore