God doesn't want to erase your past, He wants to use it for His glory.
"Always give yourselves fully to the work of the Lord, because you know that your labor in the Lord is not in vain." - 1 Corinthians 15:58
Why should I serve?
Am I now trying to win the approval of human beings, or of God? Or am I trying to please people? If I were still trying to please people, I would not be a servant of Christ. - Galatians 1:10