It is good to remember where you came from so that you can appreciate what has been done for you. The guilt of sin has gone. All the sins of the past can be forgiven. When feelings of guilt come then there is forgiveness. Also, we must always remember that we have a new life in Christ
2 Cor. 5 v17 "Therefore, if anyone is in Christ, the new creation has come: The old has gone, the new is here!"
What a joy to have this new life and to have a personal relationship with Jesus. We must remember to cultivate and deepen our relationship with the Lord.