We often spend time thinking about what happened in the past. As part of my job, I do that a lot--as a history teacher and talking to students about what they did in their past. Your past still affects you but it is what you do with it that decides how much. The history that we have as a country still affects us today, and that is one of the reasons why I study history. We understand the way things are now because of the history that has happened. The same thing happens with us. One of my students wrote a great example of this on our blog yesterday http://cedarridgeacademy.blogspot.com/2014/04/x-is-for-xtreme.html check it out.
Sometimes dwelling on the past can get us in trouble---there is nothing that you can do to change it now. You just have to move forward!