On the cross Jesus prayed a very effective prayer for the chief priests, the rulers, the soldiers, the criminals, and  for all humanity. “Father, forgive them, for they do not know what they are doing.” (Luke 23). A lot of times I don't know what I am doing. So, I have prayed this prayer a lot for myself and for others that God has placed on my life journey; "Father forgive me, for I do not know what I am doing. Father forgive them, for they do not know what they are doing."  For a lot of us the most difficult person to forgive is ourselves. Let us pray,  "Father forgive us, for we do not know what we are doing."  (repeat as much as necessary). If you really mean it, this prayer will help you break loose from  any negative thing  of  your past. 

Please read Luke 23 - John 1.

May the Lord richly bless you!