Hi TaruChan,
I read through your comic and your artwork does have it's merits. Whatever you do, don't give up, I can see genuine potential with your talents.
that being said, this line of thinking isn't really useful. I suggest you perhaps restructure your perspective and think things through a little more.
From what I can tell from this post, is that your insecurities as a creator stem from not getting immediate returns from your efforts, this is because you haven't quite found your niche yet.
Find out what it is you want to create then try to refine this until you achieve what you've set out to do.
If you want to create something immensely popular, then get a formula that is popular and adapt it so it's still artistically gratifying for you, but also interesting for the reader.
Keeping in mind that this may also mean making concessions from your original vision as an artist for your works.
If you want to create something personal, unique or weird than you'll have to accept that this won't appeal to everyone, and that it will likely not be as popular.
If you still feel unsatisfied with your work, try getting an editor to help out and direct your ideas, so your overall creation will be more polished.
I hope that helps,
-Pablo