If the past is no longer serving you , then you need to let it go, Simply by remembering that its YOUR past, and the only one holding onto it is YOU, no one is telling you to think about your past… and it does not have to limit your present. Think about it, it already happened, dwelling on it, how it couldve been how it shouldve been are all hypotheticals that waste up the present moment and dont change anything . Challenges are going to pop up in your life no matter what but problems dont exist from their own side, problems only exist from the side of the mind, a problem isnt a problem unless you view it as one . i think the same way, its hard to let yourself relax when youre thinking about the next possible problem that can occur in your life, but its how we choose to react to those problems that forms us into the people we wish to be. For example, if you get fired, you can be really angry about it and cry about it for days, but in reality that is going to do nothing for you, its not going to fix your problem, its realizing things like that that helps you let go of things with wisdom.. You can just accept it and move on, the idea of it may be hard but you have the power to accept everything in your life how it is and strive to make it better if you really want to . You create the person you are and you do not have to limit yourself ever, that little internal dialogue in your head telling you youre not good enough is yourself, and you can shut it off whenever you want to and be the person that you want to be in this present moment right now! the key is to live in the present always, and try to detach yourself from a mental image of yourself in your head that you have created because in reality it does not exist .