No one knows the right answer, no one knows precisely what will happen, no one can produce the desired future, on demand.
Some people are better at guessing than others, but not by much.
The people who are supposed to know rejected Harry Potter, Tracy Chapman and the Beatles. The people who are supposed to know sell stocks just before they go up, and give us rules of thumb that don't pan out.
If you mistakenly believe that there's someone who knows, you're likely to decide that whoever that person it is, it's not you.
And if it's not you, what a great reason to hesitate.
In fact, the gap isn't between the people who know and those that don't. It's between the people who show up with their best work, and those that hold back.