Literally, this doesn't work. Even if you grew up in a household where you got punished for spilling the proverbial milk, well, just choose not to do it today. As an old friend of mine used to say, "When you find yourself thinking about the wrondoings of your past or the things you could have would have should have, literally, move your head."
Think of it this way. Crying over the past is, in fact, taking important time away from your attempt to make right with the present. Every second you waste thinking about what you should have done before you knew what you needed to know to get some help and get "clean," you are wasting the current time showing gratitude for having a new life to live.
With gratitude follows goodness.