Preach. But add one thing: Life is not all about you, appreciate the people you have been fortunate to find along the way, because the love you share gives you the strength to do everything on this list!
Believe it or not, you are in control of your own life. You are the reason why you're sad, and you're the reason why you're happy. So don't wait for happiness. Go out and find it. Right now. And don't let anyone else tell you otherwise!