Stop beating yourself on the head with this Avastar.
Try to repair the harm that you have done with the people concerned, if you can, or do things in general reparation.
Do it in a general offering to the universe and state that you are doing it fot that specific purpose. You can even pray for the people you feel you have "wronged" as prayer is a powerful ritual.
Then forgive yourself.

We come here to learn and the usual way we learn is through mistakes. So forgive yourself.
Sometimes, we refuse to forgive ourselves through pride.

Have you learned? then the experience was useful.

Now let go of the charge because you will attract unnecessary unpleasant experience to yourself.
Reality is a complex co-creation and you don't need more hardship that life usually ditch out.
And I don't think that Karma is a black-and-white thing.