Ruminating about the past is like trying to drive backward to undo a car accident.
No matter how much you think about it, worry about it or regret it, you can't change your past. Yet, there you go again thinking about the past as if you can rewrite it. Focus your time and attention to live fully in the present where you really can make a difference.
Brothers, I do not consider that I have made it my own. But one thing I do: forgetting what lies behind and straining forward to what lies ahead, I press on toward the goal for the prize of the upward call of God in Christ Jesus.