"The past is dead, the future is not born yet, only the present lives". You probably heard this before: you can only act and feel in the present moment. The present moment is the only real thing that exists... Truth be told, no matter how much you upset yourself over what already happened, it isn't going to change. And no matter how much you worry about the future, you cannot know for sure how things will play out. So what's the solution? Simply do your best in the present moment and don't worry about the rest. Know what whatever happened before already happened and cannot be changed, so let it go, both good and bad. Live your life... now.