I feel like I have to get good grades, work research projects, and develop good relationships with other students, TAs, and professors in order to become better

I feel like I have to get good grades, work research projects, and develop good relationships with other students, TAs, and professors in order to become better. I find it hard to relax because I feel like I'll be mediocre and end up working with third-rate soulless clock punchers; I want to work with first-rate colleagues.