Some people think that happiness is to do what he wants to do, to have the freedom to choose the things myself or to select things according to their own needs without having to do anything I don't want to make.
Some people think that happiness is doing what you want to do, to have the freedom to choose things by yourself. Or selecting various things according to their own needs without doing something that does not want to do.
Some people think that happiness is doing what you want to do, are free to choose the things by yourself. Or the things as you want without having to do what I want to do.