Let's take a trek back in time and take a look at life and it's early stages of development. Life first formed upon the Earth in the as microscopic single celled organisms. Through the simple act of eating these single celled organisms terraformed the Earth paving the way for complex lifeforms, creating an ecosystem suitable for human life.
These organisms had no idea where their desires would ultimately end up. They had no sense of purpose, but this does not mean that they had no purpose. Even though they didn't know what they were here to accomplish they still reached their goal of creating a habitable planet. They never worried about not accomplishing their purpose, they never judged their peers as not doing enough to reach their goals. They had no idea what their purpose was, all they had to do was follow their desires, eat, and in so doing they accomplished their purpose.
I believe that we all have a purpose in life, a reason for being, but each of our individual purposes are far beyond our realm of comprehension. We really don't need to know what our purpose is all we have to do is follow our desires. All we need to do is find what we enjoy and do what we enjoy, by reaching for our own individual desires we will unknowingly accomplish whatever goal or purpose we are here to accomplish. Our individual reason for being might be incomprehensible, but we can simplify this to say that our purpose is to enjoy life.
Every action you make ripples throughout eventually affecting everyone and there's absolutely no way you can know just what effect your actions have on the rest of the universe. Because of this you cannot make a solid plan for the future because you cannot know what will result from each and every action you take. We have a purpose, literally everything we do has a reason for having been done, but it is well beyond our comprehension for what reason it is that we do whatever it is that we do. It is simply not possible for people to plan a course for our race, they are not capable of understanding where we are heading, they are not capable of deciding where we should be headed and neither are they capable of understanding how to point us in any particular direction.
The only thing left is to just go out there and have a good time. Throw caution to the wind and let the universe take you where you need to go. The universe is the wind beneath my wings. If you have a question just ask the universe. The universe has all the answers and holds all the keys, the universe is never wrong and will never lie to you.