There have been countless documentations of people having near death experiences and as they almost die they see "the light." When they are jolted back to reality and wake up from their near death episode, the number one take away from the near-death experience is not, "Holy crap, I almost died." It's, "Holy Moses, I need to lighten up and not take life so seriously. I better start living!"
We don't all get second chances but we can switch our path starting right now. If you feel unhappy, you have the power to choose happiness based on your actions. It starts with your perception and how you treat the world. The way we see the world is a reflection of how we see ourselves. Remembering to treat ourselves kindly and laugh often is one way to appreciate life. In order to love our lives to the fullest we can start by lightening up. When we learn to not take life so seriously, this is when we can truly be free.