Forgive and Forget

I don't know which is harder to do: to forgive or to forget. I can't forgive myself for the things I did when I knew damn well it was wrong; and as much as I want to forget, I know that remorse and regret are the only things keeping me from repeating such offenses. Without punishment, what would deter me from using the same behavior? So I can't reasonably forgive, nor consciously forget. Some life lessons are actually life sentences.