Surely you can write one word, even if it's "The" or "If" or "A". And if you've written one word, surely you can write another.
Can you see ways to redefine "enough" and put it within your reach? Can you see ways to feel like enough right now?
There is no absolution; there are no clear-cut rules that you can strictly follow and thereby relieve your anxiety. There is only you, doing your best.
This excessive concern over a minor matter sounds like the product of an anxious aversion to declaring the book finished.
Your feelings of envy are harming you by making it hard for you to achieve a degree of self-defined success that might lead to you feeling less envious.
The question is how to go about writing characters who aren't like you, not whether you are allowed to.
It's very easy, in this atmosphere focused on numbers and "winning," to get jealous, and anxious, and insecure.
You have to pace yourself, like an athlete with an injury doing slow small exercises before returning to marathon running.
Revising is as individual as writing. There's no wrong way to do it, and there are no hard and fast rules about how it goes.
As with writer's block, what's getting in the way of self-promotion is not practical but psychological.