Whom are you trying to make happy ?

Well? Who? We may say ourselves, our significant others, etc. but who are you really trying to make happy? We all have internal issues no matter what we say to others. They can stem from one of a million things that happened to us. A childhood trauma, an accident, or just any kind of horrific event. The event could have lasted five seconds or five years. No matter what it was it most likely affects your thinking and quality of life. Now, I have met people who were told things by there parents such as, "you'll never amount to anything" or "you can't do that no matter how hard you try." These same people want to do whatever they can to prove their parents wrong. So by running your own business to shove it in the face of your dad going to make you happy? No. Why? Because you did due to your trauma, not because you wanted to. The dream stopped being a dream once you wanted to prove someone else wrong. It stopped being your passion, and you just wanted to get rid of the pain. Now, that isn't to say that releasing your own album, becoming famous, or any of your dreams aren't valid. It's to say that doing them to prove someone else wrong is not fulfilling on an emotional level because you gave up your wants and desires to finish a  grudge that, well, no one else had an idea you were doing it. Robin Williams had the same problem. He had childhood trauma as a kid. His mother ignored him and well, he became famous for being funny because being funny was the only way he could get his mom to pay attention to him. This inability to live for himself caused severe depression. Humans are selfish creatures. To deny ourselves is to make ourselves miserable.
Make yourself happy first, then you can spread your happiness to others. Don't live for anyone but yourself.
That doesn't mean beat your wife because it makes you happy. For me, however, I like seeing some people smile. Therefore I make them smile because it makes me happy. Being selfish is what makes the world better. If Bill Gates, Steve Jobs, and Larry Page didn't want to be as rich as they possibly could, you wouldn't be using the computer/phone/tablet you're using to read this blog.
Being selfish can be a great asset to the world. Being greedy to the point you hurt others? Not so much. Help others with your selfishness.