Is happiness necessary to our life (must watch)

Most of the people are not happy with what they have. The people have different definitions to define their happiness. One may be happy with what they have, In my opinion the people who lives on footpath, roads are more happy than who lives at best place, have good clothes, food, equipments. What is the reason behind it? The people who are belong to middle class family they are just less happy with their life. The most important thing is that are we satisfying with our life that what we are doing? Satisfaction is more important If we are not satisfy with what we are doing, Nothing can't make our life fulfilling and happier. We must be satisfied to what we are doing? If It is empty from our life, Noone can change our life and can't make difference in our life.