I've never understood Happiness as a life goal. I don't seek happiness, nor its kid sister Contentment. Contentment is stasis, and Happiness is a false idol - not the thing to pursue, but the consequence of pursuing the right thing.
Discontent, on the other hand, is a driver. It's a force, it causes acceleration. There are things I want to see int he world that do not yet exists, I am driven to make them. There are changes I want to see in the world, discontent drives me to try and change them.