The past is the past. If you don't realize that, you will go on living your life, in the past. Living in the past is self-inflicted torture. If you focus on the mistakes you made in the past, if you try to be cool like you were in the past, if you try and live in the past you force yourself into a box. You want to live in the present, be the best person you can be this very second, be the greatest of the great in this time. Be you right now, and don't be anyone else.