Sup Aqua,
Self-Confidence with one's own work is a strange thing; when you're looking for it when you're starting out at the bottom of the mountain, it's almost as if every above you had it already before they even started climbing.
I've given some insight on gaining the confidence to begin your creative project on a different thread and I think some of what I've said may apply here. This is the abridged version of the points I made:
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Confidence is Fleeting: The sooner you realize that confidence is more like a wave that comes and goes, the easier it will be to feel when it has arrived and ride it.
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This is the Worst You'll Ever Be: If you're goal is to be better tomorrow than you are today, then you can take solace in that the jejune spool you're producing right now will be presentable and something you can be proud of in the near-tangible future. So don't stop.
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One Finished Mediocre Novel will Always be Better than 100 Brilliant Unwritten Ones: "The most important thing in writing is to finish. A finished thing can be fixed. A finished thing can be published. A finished thing can be made into a movie. An unfinished things is just a dream. And dreams fade if you don't hold on tight enough. So finish the thing." C. Robert Cargill.
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You Don't Have a Choice: Just a harsh, succinct reiteration of the previous point. If you want to make it the industry, if you want your dreams to be something more, if you want make money doing what you love. Then start writing/illustrating/singing/composing/studying/filming/investing/doing: you don't have a choice.
So with the starting out of the way, it's fitting that we now focus on retaining that confidence throughout the creation process. The good news: it's possible! The unfortunate news: a lot of what I already said above is going to be touched upon again, and self-confidence in your work will take immense amount of internal mental and emotional work to retain, and even when you grasp it, and feel it's invigorating warmth in your palms, it will up and leave, awaiting recapture, sometime late in the night while you're deep in REM sleep.
So how do we build upon that sliver of confidence we used to start our comic/novels/films/albums?
Well, if you're green, then than the first issue you're probably dealing with is that you feel like an absolute poser.
If you haven't already, think about it: the feeling of anxiety when someone asks about what you do, the apprehension of you claiming it to be your craft, then the ultimate omittance of it entirely, in favor of answering with something 'acceptable'; thus, relegating your passion to something hidden, forbidden, taboo.
It's all because unlike the greats that have inspired you, there is nothing in your possession -- no real or tangible credential -- that verifies what you wish to claim to be.
So, there is only one real remedy to this affliction of charlatanism: Make that first thing (and when I say 'make', I mean 'finish'), then make more of those things until your drawers weigh so heavy with material, that the next person to question you on what you do shall be met with your blind reach into the towering mounds of your work behind you, followed by the swift hurling of the first piece your fingertips touch -- at their body in high velocity -- in hopes that you can return to your work sooner for you are far too preoccupied to await their thoughts.
Keep Creating. Finish the things you start. I know you may worry that what you're producing is crap. Surprise -- it is.
And so was every single one of your biggest influence's initial pieces of work, and any one who claims otherwise is a liar or hasn't finished anything themselves and should be flogged for spreading such fallacies.
Unless you're Mozart, Stevie Wonder, or Damien Chazelle, than you just have to bite your tongue till the throbbing pain and taste of copper distracts you from the utter hogwash that is your inceptive contribution to the world, and start working on finishing piece number two -- which you will be sure to make better than the one before it.
After you repeat this process over and over again, you will become better -- and experience comprises experts, not moments of brilliance. Prestige is earned and mastery is work towards, and both those things instill confidence.
And at the very least, if you have volumes of work, enough to make someone question the sensibility of even asking what you do, then not a single soul can claim that you are not in fact, what you state yourself to be. And there is a certain confidence that comes with being indisputable.
So keep doing what you're doing every day and keep climbing that mountain. Record your journey, and stick thos orange flags of progression in between the crag's cracks and crevices, because you're going to reach an altitude on your climb where not even confidence will keep you going -- and your lungs will constrict and you will feel your grip loosen and your body about to fall -- but then you will be able to look down, and see those flags (those little bright beacons of proof of how high you've achieved) and you're second wind will come and your will continue your climb, unfettered on how well everyone else is doing, because you did not think that you would have ever been able to get this far; and that will be enough for you to keep going.