There is an appropriate way to use your story, not as an excuse but as a testimony to God's ability to free you from the past.
Jesus never allowed His theology to get in the way of His ministry.
When I count other people's blessings I lose sight of mine.
You have no idea the numbers of people that God may want to influence through you
It's ok for people to feel bad about the wrong things they've done.
Stop looking for solutions to problems and start looking for the right path.