I think it's one of those things where every artist does it, but something I came to a realization about was that I was comparing my work to people whose work I didn't really like. "I don't have the style of that artist," I'd think. "They have a distinctive style. I don't like it." But for whatever reason, I kept riding myself hard because I didn't consider myself at that level.
But I was. Even technically speaking, I was always doing fine. It's something that even now I struggle with, the temptation of comparison -- it's toxic, more times than not, and as others have pointed out, sometimes you have to just step back and just stop looking at others if you're going to be tempted to compare yourself unfavorably.
Artists are almost always our own harshest critics. And people are almost always their own harshest critics too; artists get it double! It's important to realize this and let it go, appreciate that you will be developing your style throughout your life and just keep doing that instead of comparing yourself to others who are likely struggling with the same insecurities.
You can do it! 