This is a very good comic, and it describes every author (or #artist) who is unsure of themself. Don't let this be you!
Complete stories (your vision) regardless of the merit you see in them.
Start a next one. Full stop. Then another.
Complete and send out more stories even if some editor (or commenter) doesn't buy or like them.
It's all practice, every single failure or not-good-enough. Practice makes you better, whatever they think, or you think. Keep practicing.
Take from criticism only whatever helps you identify or fix problems; reject being put in your place or ridiculed. It's practice. Your art is unique to you. Be truthful with yourself, though.
Keep starting and completing stories. Statistically, some will be good—and you will start to recognize the wheat in the chaff.
Their first stories weren't fabulous. Neither may be yours. The difference? They kept on starting, completing, sending (or posting), until they found success. Let that be you.
Please remember: #boostingIsSharing and boost to give others a moral boost.