Work and live to serve others to leave the world a little better than you found it and garner for yourself as much peace of mind as you can. This is happiness.
My dad was a Marine. He was one of the Montford Point Marines. Those are the equivalent of the Tuskegee Airmen for Marines. He's a tough tough guy. When I was 15 we had a fight and I didn't speak to him for 10 years.