Always good to be skeptic and positive. One of my friend said the time has not come for people in earth to know beyond our understanding. 1000 years ago, it was impossible to know the present day galaxy or black holes or electron as the body of knowledge was tiny similarly today we are not equipped with knowledge to know more than it permits. There is exponential explosion in knowledge and may be we find what was before big bang or if there was big bang (for skeptics). But for now this is what we have and that's why among all things knowledge is the only thing that keeps on driving human ahead and make them curious, rest is old, plain and simple.
Why does the universe exist ? Was it always there ? What was before big bang? Are we, the earthlings, only living species ? Does existence have purpose ? How old is the universe ? Is there some repetitive pattern ? or What is nothing or something ? Do we know all things that we not see (even through all the waves and instrument ) ?

For now we are still in dark ages on the knowledge of our universe, those who try, seek for new frontiers of knowledge, those who give up say " Universe is vast unknowable". There is no rule about what should we do about life seek pleasure or knowledge. IMHO seek what keeps you awake at night.