Would you drive your car by staring into the rear view mirror instead of looking ahead?
Let's use driving your car as a metaphor for life. It makes sense to focus on what's in front of you and be aware of your surroundings while "driving." What's in front and around you takes precedence over what's behind.
The past can help you learn from your mistakes and give you context for making better decisions, but dwelling on it can destroy you. Successful people don't sulk about their past. They recognize it and move forward. How do you know if your past is guiding you? See how often you repeat making the same mistakes over and over again.
People who live in the past make excuses. They play victim to their circumstances. They believe they have no control over what will happen next. The problem is they choose to believe all of the above is true. When you create a self-fulfilling prophecy about yourself usually it comes to fruition.
If you want to escape your past and move into your future, you've got to stop looking in the rear view mirror for answers. Your ability to "move on" is determined by your perspective.
Don't be a prisoner of your past. Be present and focus on the future. It's your choice where to look while you're "driving." What direction are you headed towards?