I believe the mature artist is willing to admit they are the eternal student— they consistently wonder how they can (or must) improve.
In that process is maturing, or growing up, what I think is crucial to know (and keep close to you) is to remember the critical who critique YOU rather than your WORK, are disingenuous readers. Those who engage the work, and their criticisms show that, their critique has merit, and should be considered.
A key I have learned is not everything is for everyone — but everything I write is for me first.
With that first thought, I must realize the work I want to create must be dependent on my own talent and strong enough to withstand what people may think of it— ie because art is subjective, I must be able to understand an observation and ignore when need be.
Do I get it right all the time? No. And I assure you neither will you. The goal is to create the work you want, endure the criticism you must, while striving to be better.
You are your own competition. Not the faceless internet.