Many are concerned only with their happiness.
I counter happiness is overrated because the world is a miserable place where happiness finds no purchase.
I love the misery of living because that is what marks us as human. I also find the best and most interesting work comes out of misery and not happiness.
The next time you are feeling unhappy — do something proactive — create a monument to your state of mind and celebrate the fact that you were able to accomplish something of merit even though you were not happy.