I had some friends in high school, but college was different as there was so many different interests. Especially in the junior and senior years of the university, the people in your classes are majoring in your same major, so you get to know them. That, and people who are in college actually want to be there because they're paying for it. If not, they can easily drop out without any major consequences legally for themselves or their parents. Teachers treat the students as the mature adults they are, and leave it up to the student to pass or fail.
High school is different because people have no choice in the matter. The administrators spent most of their time handling disciplinary issues, and guidance counselors didn't have time to really advise you on college, or financial aid. With the students, it's all about "fitting in" instead of about learning or what college you planned to attend after you graduated.
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"I do not feel obliged to believe that the same God who has endowed us with sense, reason,
and intellect has intended us to forgo their use."
- Galileo Galilei