Chasing after an illusion is equivalent to chasing nothing.
Just figure it out along the way.
Once we get what we want, we vy for something else. Our needs cannot be satisfied; they only enlarge. Suffice to say, if you don't achieve something, the world doesn't end. There's always something else you can aim for. That's what humans do.
Everyone is born for greatness. But if you just keep daydreaming about greatness without getting into the work, you won't live your dreams.