I know it's a stupid analogy, but your situation reminds me of when I joined my high school orchestra as a violinist. I thought I was good at the violin, but the others in the class were almost invariably better than I was, not just because they had fancy private lessons or had been playing longer than I had, but just because they were much more talented. Even though it didn't really matter, since I never exactly thought I was going to end up a professional violinist, it did bother me. But finally, I came to the conclusion that it didn't matter: I liked the violin and being surrounded by people who were better than I was only made me work a little harder and learn a little more. My ego hurt at first, but I enjoyed myself and I learned.

I acknowledge that this is something a little different because it's more important to you and it will ideally become a career, but I think that as long as you are learning something and doing the best you can, you have absolutely nothing to be ashamed of. School is about your personal intellectual growth. It is not about being better than anyone else, and it is about you and not them. If you like what you're studying, you're learning, and you're trying, then mission accomplished.