I think it's pretty normal to compare yourself with others, especially when it comes to creative endeavors. I know I struggle with it. But instead of just getting bummed out about myself/my art, I try to remind myself that comparison is the thief of joy. Instead of thinking "Why am I not as good as they are?!?!", I focus on what it is about this person's art that I like/appreciate/admire. I try to see how I can learn from them and improve my own art.
I don't think any artist would want their art to make someone else (especially other artists!) feel inferior when they look at it. I know I wouldn't want that. I still have a lot to learn, but I hope that one day my art inspires others. So rather than dwelling on my "shortcomings" (for lack of a better word), I try to think constructively about how and what I want to improve upon.
Buuuttt that being said, I do still get discouraged sometimes. It's hard to stay positive haha. When that happens, I look at my old art, for chuckles and to see how far I've come.