What my experiences have taught me is that when we think about the past too much, we get tunnel vision and subsequently when we look into our future the past is all we see. When that is all we see we cannot move forward.
The past is nothing more than a basketful of experiences, events and circumstances in your life that could possibly change your impression of what is possible in future.
Do not look back as the past is over, your future is full of infinite possibilities.
Live in the moment and not in the past to realize your full potential