Purpose of our existence

What are we struggling for and what are the purposes of our existence?
Nietzsche would scoff at such questions as to him, life, being and the world
come into existence before rationality has reigned. We should not be too
disappointed if we failed to explain the former with the latter. In fact, Niezsche
concludes that this is the very source of our unhappiness. But what does this
have to do with us?

I still cannot stop questioning, cannot quit thinking and cannot sit idling, but
ask the same questions again and again... Where are we going with our
life and very existence?