I didn't hugely enjoy school socially, but I did find the classes, well, educational. I learned a lot of things on my own or from parents as well, but in high school I had basically a few hours a day set aside to studying stuff that I might not otherwise have studied, from math to U.S. history to art theory. I also got better at communicating an argument in short (2-5 page) essay form, which has been a useful skill later in life.
One additional aspect is that, while many classes were too easy/slow-paced for me, the fact that they weren't for everyone else made that a useful experience too. For one it was interesting to understand what people found easy or hard to get. For another I would often help other students with their homework, which was good practice in how to explain subjects understandably, basically in how to do tutoring.
One additional aspect is that, while many classes were too easy/slow-paced for me, the fact that they weren't for everyone else made that a useful experience too. For one it was interesting to understand what people found easy or hard to get. For another I would often help other students with their homework, which was good practice in how to explain subjects understandably, basically in how to do tutoring.