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?
Yes i believe its true, all people wants to be happy, all people doing things because they want to be happy they want other people to be happy, so human goal are to be happy and succesful in life.