Might not suitable for anyone who still having fun with their drawing, due to they might misunderstand the point. This is a life advice in advanced level, for anyone who want to join the golden road of professional artist.
"Survival instinct bias", that's what make you miserable. It's not your fault at all!
Your survival instinct will always try to find instant short term reward, and have no interest in long term reward.
You're not fighting with yourself, you're fighting with "ancient human instinct".
You have a strong survival instinct, if you lost in a forest, you might have a higher chance of survival than others. The problem is, you have no (and will never) need that kind of instinct in modern age. That's how your survival instinct fail you.
"How to fight it then?" you ask.
It's simple but isn't easy: Burn yourself out with hard work and stop comparing with others.
Burn yourself out with hard work will put you in the worst situation ever, but worth it! That's how you fight your instinct that always trying to help you safe and help your stomach full. The fact that creating comic couldn't help you make a living, is make it worst. You have to teach your instinct to understand that "hardwork" isn't danger. And after every hard work is the happy reward, just buy yourself a giant cake if you like.
Mistake and imperfection help your artworks look more natural and organic. You rarely see any mistake in other people artworks because you aren't trying to find one. You look at the whole picture and asume that "this have no mistake". But the truth is, every artwork have a ton of mistake, and that how it make your art feel great and natural. Would you look at a bow of cereal and think, "hey, this grain isn't in a perfect shape! this bow of cereal suck!", wouldn't you? You will never be perfect but always be "good enough for now", that help you have the goal for your life. Thank to your "good enough for now", you know how to improve and create something better each time. It's help your life more varied and abundant, plentiful. A flower isn't trying to be perfectly beauty, a flower is only trying to be a flower, nothing else. Nothing is perfect, and that's what make everything beautiful.
Sacrifice yourself for your ultimate goal. You don't need entertainment, you don't need good food, you don't need friend! You put your life holding your pen and drawing from day to night. You don't need to care about the world! You don't need to have fun! You sacrifice everything into one goal only, being a professinal artist. If you want to having fun and make a living, you can be a hobby artist. But if you want to be a professional, then I'm sorry, being a professional isn't fun at all.
My goal is to become a professional artist too, and based on your post I might understand how you feel. 
I hope this can help you find out more about yourself.