All the things you think you should have done that you didn't do, and all of the things that you shouldn't have done, accept them. You did (or did not) do them. That's reality. That's happened. No changing the past.
What is meant by reality? It would seem to be something very erratic, very undependable -- now to be found in a dusty road, now in a scrap of newspaper in the street, now a daffodil in the sun. It lights up a group in a room and stamps some casual saying
Reality is what we take to be true. What we take to be true is what we believe. What we believe is based upon our perceptions. What we perceive depends upon what we look for. What we look for depends upon what we think. What we think depends upon what we perceive. What we perceive determines what we believe. What we believe determines what we take to be true. what we take to be true is our reality.