The basic point of existence is simple, you're the furtherance of the concept of survival, but you've evolved past a basic piece of bacteria or other such life-form and survival is now not a struggle so much, just a daily routine (eat, drink, process waste).
We evolved as creatures needing to survive, now we're surviving, there's any number of options for primary objectives.
Most people find their "calling", be it artistic, monetary or otherwise.