People mostly confuse happiness with satisfaction. Satisfaction is about favourable, pleasant, pampering, or exciting circumstances. Happiness is coming from within, it's that warm feeling that life is good, and we are good. Happiness does not depend on the circumstances. And, contrary to so many songs, no one can "make us happy". What comes from others may be taken away from us, and happiness always stays with us. It's like a biological fact - we breathe for ourselves, eat for ourselves, and we generate happiness from within ourselves. Happiness is loving.
A happy person may be dissatisfied with a flat tire on the road, or satisfied with a promotion. but that has nothing to do with his deep, spiritual relating to himself and his life - which spells his happiness.
On the other hand, an unhappy person may find excitement in sex, possessions, gambling, play, shopping, or other circumstances, but that won't make him any happier. That's why some celebrities, with every reason in the world to be satisfied, still commit suicide or otherwise ruin their lives - because of that spiritual emptiness, meaning lack of happiness.
You may go to a third world country and find some incredibly happy folks, loving who they are, loving their life, feeling playful, relaxed, friendly.