Hey, really sorry you have to go through that. I know it can't be easy, but thinking to yourself that they really don't care about you does help. I know it sounds strange, but bear with me. Just think about it, they have probably bullied dozens if not hundreds of kids in their lifetime, at your school or otherwise. Do you think they'll have a personal grudge against you? Of course not. They just happen to be generally cruel and inconsiderate human beings, nobody should ever take bullying personally - it is never about you, it does not mean something is WRONG with you. All it is is about the bully letting their insecurities out on you.
What I'm trying to say is you should force yourself to erase this period of time of your life out of your head. Even if you did meet a bully in the street for example, what tells you they will even remember you. All you were to them was a punching bag and, especially if you portray yourself as a grown, confident and improved adult, they will forget who were and just not even consider it. Bullying is rather juvenile behaviour and they probably will have forgotten it ever happened.