Critiques should not make you question the value of your work, or the value of yourself.
You already made your work in the best way that you know how. Now you need editorial advice. That's part of the process for any writer, and being an editor in no way exempts you from it.
The best editors act as therapists and teachers too; like therapy and education, being edited can be emotionally difficult and a challenge to your skills, but if you bring your A-game and ditch your ego, you'll get a whole lot out of it.