Learn from the past but don't live there. Live for the here and now. Let the past and the mistakes you have made teach you what not to do again. Let today be the day you pay attention to what you let your mind dwell upon. Know this truth-- incredible change happens in your life when you decide to take control of what you have power over instead of wishing control over what you don't.
Don't regret the past. Learn from the past. There's a huge difference. Mistakes are painful when they happen, but years later, a collection of mistakes is called experience and will lead to success. During difficult moments, you are growing and those mistakes are teaching you a valuable lesson.
Your past is your education. Embrace who and what you are!!