I know it's easy to say: "Just let go, move forward, forget about it, just let go." Let's face it, that's easier said than done. But ask yourself these questions:
Do they serve you any purpose?
Do they help you move forward?
Do they work in your favor in any way?

Hanging on to negative events can destroy your life in ways you're not even aware of.
Sure there have been negative things that have happened, I'm not asking you to ignore them, acknowledge them because they did happen.

Think of it this way; you're on a hiking trip and along the way you keep picking up heavy objects, things that really don't serve you but you want to hang on to. After a while these objects begin to weigh on you, they slow you down and unless you get rid of them you'll never get to where you want to go.

You can begin to let go by simply getting your mind to focus on something different. That will help but if you really want to start moving on then you have to get your mind to focus on new things, then you'll automatically let go of the negative events and situations that have been slowing you down. Then begin focusing on what you want next; focus on what is
important and what can improve your life. This will get your mind moving in a new direction. When you begin focusing on more positive things and focus on what you want you begin shifting that energy and start attracting positive situations to help you create the life you want.