for me its a yes! the main goal of human is happiness whatever human wanted to reach it towards to his/her happiness.
For example why do people want to work? because they want a better life, and if they reach better life they also reach their happiness.
So for you what is the main goal of human?
No, happiness is not main goal of a human. I remembered one book title " Purpose driven life " through this you will find out the real purpose of the life of individuals after 40 days of applying what is written in the book.