I am always reminded of David Foster Wallace who wrote a successful novel while still in his early twenties, and before even finishing his MFA. He had to recalibrate his entire life expectation wise when he achieved his goal in his 20s and found it empty. Where do you go when you are just 'starting out' in life but have already grabbed this thing that was supposed to complete you, and it doesn't change anything.
As much as I enjoy DFW's way with words (and I do mean that in a complimentary manner), I think his approach mostly serves as a warning as to what can happen when you get too deeply stuck in your own head with no pressure release valve to viewpoints other than your own.