I’ve done alot of mischievous and unkind things throughout my education time (k-12) I made fun of people, bullied people, stole from people/stores, hit people, kicked people, did things to annoy people, and just overall did stupid shit to cause problems all because it either felt cool or because I thought it was funny. Some of these were things I did because my friends did them, but some were just me being stupid on my own. I am now 21 and recently I have thought about all of this and feel awful about the things I’ve done because I know it has affected people. I wish I could go back and have never done any of it. Is something wrong with me? Am I a bad person?
Being able to acknowledge you did something wrong is a good first step. The next step would be to try to make it right as much as possible. Most people will likely have forgotten all about it though, unless you were a particularly egregious asshole. If you feel you wronged someone in the past, you can reach out to them and get their perspective. If they feel the same you can apologise and try to make right any lasting damage you caused.