God gives us the greatest gift. Those mistakes no longer have power over you. You don't have to remember every mistake, every regret, everything that you wish you could change, for every moment of your life. That shame is NOT your identity any more.
So what is the point then? Every mistake covered by grace serves a purpose.
Maybe it's to connect someone who's struggling. You can use your experiences to help someone else get through a tough time in their life.
Maybe it's to be an example of how God's grace is powerful enough to cover anything! It's hard sometimes to believe that God could and/or would forgive everything that you've done. You can be an example of that for people who feel like they're too far from God.
Maybe God wants to teach you something about him or your relationship with him. Be open to learning what he wants to teach.
God works everything together for the good of those who love him. Hurts, sins and mistakes are no exception.