A very good friend told me this just a couple of days ago but I understood it, felt it and got what he meant just a couple of minutes ago. "Happiness is one of the most abstract words in the whole world."
Happiness is what YOU define it to be. Maybe that's why we say people are not in competition in life. Everybody is trying to find happiness but as they have different descriptions of it, logically they are not competing with each other.
Happiness becomes what YOU want it to be so be carefull what you write in front of "Happiness=..."