Life is all a big game where in the end we all die. The key to life is to be happy, if you can accomplish that you win the game. Only airheads think having the most money or power will give you a better life. Life is only as difficult as you make it.
We've all made poor decisions in the past, no sense in thinking about things which can't be changed. Parts of everyday life seem trivial after looking at the big picture, and that's what I find myself doing a lot to put myself back in line.
Just remember it's all about you. That's not just some silly motivational saying, that is a truth. The world does not exist outside of your own senses.