Paul said in Philippians 3 : 13 – 14”Brethren, i do not count myself to have apprehended; but one thing i do, forgetting those things which are behind and reaching forward to those things which are ahead. I press toward the goal for the prize of the upward call of God in Christ Jesus”.
In verse 15he said ” therefore let us as many as mature have this mind and if in anything you think otherwise, God will reveal even this to us.”
We should forget our past so that the weight of the past cannot continue to weigh us down and to enable us focus on what God has for us in future.
Your past is gone and you cannot do anything about it. Focus in the present and your future.