I'm a creep. I used to stalk girls and make them very uncomfortable around me
It's good that you realize this but what exactly did you do to make them feel uncomfortable?
I used to have a super weird persona, I used to stare at them without being noticed and when they noticed me I always found a way to save myself
It is disturbing that you would do this to girls. You should not stalk people. It is creepy and against the law.
It felt good as a kid and I don't need to apologize.
You need to apologize for making people feel uncomfortable. Your actions directly impact those around you and if you're doing something others don't like, then you are at fault. You're better off learning how to not be creepy and getting better at socializing with others.