Go through life as your authentic self. You only get one life. And if you are asket at the end of your life if you are happy, wouldn't you want to say Yes? That's basically my concept. Or did you not understand the German song title?
One day the reaper will come for you and ask for the truth: "How are you? Are you happy?" What will you respond?
God is dead, and all we're left with after this life is death. And what does that mean? It means that we have a chance. We have a chance to live a happy life on our own terms, without pressure from others, without any fear. Will you use your chance? Also, don't fear the reaper, he's a really nice guy and a part of life. He's your friend. He's the one who makes every single moment special.