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?
we should go for a big YES nobody wants to be lonely but in this world we cannot be happy always because sometimes we have a problem,so it is so hard to be happy always at a time.