All the things you think you should have done that you didn't do, and all the things you did that you think you shouldn't have done, accept them. You did (or didn't ) do them. That's reality. That's what happened. No changing the past.
When we put things off until some future-probably mythical-Laterland, we drag the past into the future. The burden of yesterday's incompletions is a heavy load to carry. Don't carry it.
Learn to forgive fully and completely. If you want health, wealth, and happiness, you can't afford the luxury of lugging around all those unforgiven, unforgotten past events. Let them go.