I had to make the same adjustment to medical school. In college I HAD to be in the top 10%, or else I never would have gotten accepted. You become like a thoroughbred, all you really know how to do is study for and pass exams. When I started medical school it was a little jarring to be “only in the mean”, but fortunately I adapted quickly, and as a result enjoyed life and grew much more as a medical student than as an undergraduate. I had several friends that could not complete the adjustment, and as a result at times grew discouraged and depressed. It is a shame that higher education has to be this way, but I can’t think of a better system.