We should learn from the past, not live in it

I find myself constantly looking back, thinking about the past and remembering stuff when I should be thinking ahead! and focusing on what I could be doing today... or pumping myself up to get ready for this week! Don't get me wrong, I do plan ahead but why is it that I get stuck in the past when it's over with and done and I don't think there's any way that I can change it.  Move on! Tomorrow is important. If you fail to plan than you plan to fail!!