For me happiness is a terrible life goal. Sure it's nice to be happy, but its such a vapid meaningless emotion. If I were to optimize for "happiness" I would just cash out, abandon my family, move to Vietnam, play video games and eat Hot Pockets all day. It doesn't take much to ride out the rest of my years.
But the life I choose is hard because doing hard things is good and fulfilling. I often willfully forgo happiness because, you know, I'm an adult. Maybe I'm just stupid?