Another thing, that's sort of the reality - there's always someone better than you somewhere. Managing expectation is key, which is a common thing for new uni folks to learn anyway.
What you can do is to just try your best and have fun. Easier said than done, but do try your damn hardest, as maths is hard. I find talking maths with people who are better than me a very rewarding uni experience, and given how vastly different styles of maths are tackled in different modules, you'll almost surely find someone. The benefit is mutual, IMO.