That question was used to confuse people back in 3000 or 4000 b.c. and were then classed insane. Now its just a question to piss off people.
The answer lies within your belief, if you are Christian or a spin off e.g Morman, Amish, etc then you were crated by god, if you are an Atheist then life and yourself are figmentations, if you are a darwinist then life is about domination and being the best.
So in easier terms, what ever you belive in is the answer and if that is to complicated then I can't be bothered simplifying this out