I think we all should from time to time do this. Over a period there are somethings that you feel went wrong. The optimistic mind would say, let things happen the way they are. It has happened because it was meant to happen. Or rather say, was in my destiny that it had to happen.
Now I am a strong believer in luck. The harder I work, the luckier I get.
From time to time, I pause. Take a deep breath. Look around and reflect. The reflection is not meant to be a way to think how I could have changed what happened, but rather as a motivation of how I would do things in the future.