You, too, have a story, and it is possible for that tale to evolve. You, too, are no doubt plagued with terrible memories from your own past. Mercy and forgiveness are necessary for progress at times. You have to accept the things you can't alter and let them go. When you made a negative interpretation of an incident in your past, you misread its significance. While it's true that you can't alter the past, your perspective is entirely up for grabs.