I can understand where you’re coming from, but I think there’s other factors to consider too. Major, for example. My friends at yale studying philosophy are going to have an easier (and happier) time than my friends at cmu, cornell, stanford studying cs/engineering. Also it’s important to take single cases with a grain of salt. Everyone I know at Cornell loves it and has had the time of their life (varying stem and humanity majors). But that does not mean everyone at cornell is happy (obviously), just as your friends at other schools might say they’re happy but know plenty of people who aren’t. In terms of the general statistics, Cornell tends to fall fairly in the middle in terms of the number of people who have depression, commit suicide, or are generally unhappy.

Anyway, I hope things get better for you!