Some people think that happiness is what you want to do. Having the freedom to choose their own life, walk or do other things based on their own don't want effortlessly do what I don't want.
Some people think that happiness is doing what you want. The freedom to choose their own way of life or do things if they themselves do not want to do something like reluctance.
Some people think that happiness is to do what you want. The freedom to choose their own way of life, or choose to do things by himself to not be forced to do things you don't want to.