The primary character was a man who was supposed to be born an Alpha but something went wrong and he was born an Epsilon if my memory serves me. We read this book in my Junior year in HS.
If he was born an epsilon he’d be Joe Biden! The lead character is Bernard Marx born a high caste Alpha (but not a Alpha+!). He is shorter in stature than the average member of his high caste, which gives him an inferiority complex. Its an excellent read and as others have pointed out a much more prophetic dystopian novel for our time.