I definitely had some times in school that were less than ideal socially, especially after my family moved to an entirely new place. My family moved from NYC to a small rural town, and adjusting to a new way of life was interesting. I didn't help that I had a thick accent and hardly anyone could understand wth I was saying! But overall, for me, school wasn't so bad at all, and I look back fondly at my experience.

Perhaps I'm a duller knife than the others in this thread, but high school in particular was incredibly useful for me. I enjoyed it. In my life, I've found self-learning works for specific tasks, but I find it difficult to self-learn for general educational purposes or without a specific goal.

In high school, I found my voice from a writing perspective, discovered drama, and a dozen other things. Looking back on my career, the experience of doing literary analysis in American Literature (Grade 11) or writing long-form essays based on primary sources in a limited time-box for AP History, or speaking in front of a crowd (Drama Grades 10-12) and getting over my shyness was arguably more valuable for me than the specific domain knowledge that I studied in college.