You say that by comparing yourself your work is "noticeably worse" and yet you cannot point out one single thing about what it is what you dislike about it? Have you tried then asking what are the things that you like about other people's work? Why you consider them "noticeably better"?
If you cannot make a good use to comparison nor make it a tool for your own benefit, then you'll need to stop comparing yourself to others since it's only autosabotage and just a way to discourage yourself and making you hate your work and current abilities more.
The internet is vast, whatever you wanna learn to later incorporate in your work is there, coloring technique, color theory, lightning and shadows, textures, prespective, depth, anatomy, different styles, even drawing in traditional instead of digital or mixing both techniques, or even more methods, etc.
Creativity is not only having ideas about what to draw, but as well the innovation of solving problems, but you won't be able to use creativity if you don't nurture yourself, Creativity requires knowledge, learning and studying so you can later apply it to anything you're struggling with and as well, creativity strikes when you're already working, instead of hoping that others gives you concrete answers to questions that you can't even give a proper shape (And even if you did, there aren't always answers that are 2+2=4).