If I could go back in time I would not change a thing. What has happened had to happen to make me who I am at the moment. If you could change anything in your past it would have a ripple effect in your future and in the lives of the people currently in your life. Every action and every moment in the past was building up to this moment in time. From now on every moment will be building towards another moment to somewhere in the future. Stop worrying about the past, it is over, no sense in regretting what has been done, you cannot change it. Live now, the past is gone and you might never arrive at the future...