Oh I think that we all should try a lot of things until finding DA thing, it's not that we are born with that answer. The world is simply too big and offers too many possibilities to know exactly what we need. And it also evolves a lot, so there is no way for our biology part to know what to do in life since the moment zero.
Hahaha, why you think we like so much RPGs? Because it is life it self but with absolute power of choice! We can even go back in time and change our actions! That s why!
In life time doesn t stop and actions have consequences beyond our control and comprehension, this is why sometimes we can't handle it and feel overloaded and upset.