“Every saint has a past, and every sinner has a future.” ~Oscar Wilde.
Draw a line in the sand of your past behaviour and leave it alone. Concentrate on the person you want to become, not on who you were. When you do this, it sends the right message to your subconscious mind and allows it to create the behaviour you wish to show the people in your life.
If this is something you’re having difficulty with, here’s some good advice from George Bernard Shaw on dealing with your past behaviour.
“If you can’t get rid of the skeleton in your closet, you’d better teach it to dance.”