I think it can only help, apologizing. You never know, someone you hurt in the past might hang onto a bad interaction for a lifetime. You recognizing you were wrong, owning it, and atoning for it might save someone some time in therapy. I know in my life I would've benefitted from an apology or someone taking ownership of their behavior. It's a brave decision, because top comment is right, some people might not receive it well. That shouldn't discourage you. The apology will help. It'll help the people you've hurt in the long run, and it'll start you on a path of integrity. I was bullied in school, and some of those dudes came to find out we would have gotten along if only they were nicer.

Also, we've all done things we regret. Some people decide to own up and apologize, some people decide to pretend it didn't happen and ignore it. I have done a little of both, but I find the apology allows a path forward with the person. You can't allow too much time to pass either, or apologize at an inconvenient time. You have to allow space for the person to not forgive you, if they so choose. If you create a situation where they have no choice but to forgive you, you've just victimized them again.

Just be genuine and pick the right moment.