As the year begins to close out (hear me out, I know Christmas is first) I'm sure you are thinking about what you could have done differently this past year, or what you should have done differently in 2017. One thing you should know and understand is that the past cannot be changed. At this moment, you should focus on your present and future.
I am not saying completely forget about what has happened this past year or years previously, but do not dwell on it. Take from them what you can, and utilize it to enjoy your future endeavors.