Indeed 'why do we have to do something with our lives' ?
Isn't it all a mere illusion, an absolute make-belief notion that we, human beings, have created to get through life ! To attach a value to something that, in all logic, has not intrinsic value of its own. And why ? Because we don't 'like' the notion of knowing that 'our lives meant nothing' that there has to be a higher purpose to them; that our very existence was nothing more than a biological blip on the evolutionary scale of things....that the Universe doesn't give a frig about us ? That we are beyond insignificant and that to weave this absolute moronic fallacy even further we associate value to things in life that, logically speaking, have no value at all or that the very notion of 'values' is absurd when there is truly nothing more to life than the very grim truth that we live, we grow old & then we die !