It’s interesting that some folks believe that they have done too much wrong in life to ever be useful in the world in a positive manner.
It’s even more interesting that some feel that their past means that they cannot have a relationship with God. Your past does not dictate your future.
Your past is a tool to help heal someone else in the kingdom. Don’t hide the ugly because if you got out of it, you now know the escape route. Someone else needs those directions.
Withholding the directions not only may be delaying the saving of another in need but delay your future sermon that is inside of you.