Why are we so unhappy with our lives?

If God appears and gives a boon, I bet 95% of people would ask for happiness; Assuming that the remaining 5% are already happy. Everything we do in our lives is for happiness. Isn't it? Some people find happiness in earning money, some in helping others, some in fame, some in taking care of family, some in hurting others and some in serving their country. The paths we choose may be different, but ultimately we want to be happy. But, how many of us are really happy with our lives? After I finished college, I was so excited that I could go to work and earn money. (At that point of time I was sure money would make me happy.) I got a job and was really excited to take my first salary. I bought everything I always wanted to buy, branded clothes, a smart phone and went on a date with my own money. Oh my god! I was so happy. Very soon I was no longer happy with what ...