As with most things, it depends on the mistake. Sometimes you can fix things, or apologize for what happened, and sometimes there really isn’t anything you can do. Whether too much time has passed, or the mistake is unfixable, sometimes you have to understand it, learn from it, and let that turn you into a person who wouldn’t make the same mistake.

When it comes to forgiving yourself, I don’t have an answer. I think talking about it with someone close might help, whether it’s a therapist, a pastor, your parents, or your best friend. Getting someone else’s perspective on it can help.

Best of luck