The past is the past. Sometimes we fill our past with many mistakes, or things we thought would be best at the time, but the best part about the past and mistakes is that if your still alive tomorrow you have a chance to take something from it all, a bit of knowledge to help you chose the better path in the future, a path in which can lead to great things if you learn from your past and make the the best decisions in the future.
Here's to your future Der, live and learn, screw up in the past, work harder tomorrow to be better than you was yesterday.
Best of luck to you Der.