You probably wouldn't know it.
I felt incredibly restricted at my old school: I remember feeling either forced to participate in activites (the music director once lectured me on how it was my obligation to perform in the concerto concert, even though I wasn't learning a concerto at the time) or sensing that there wasn't the opportunity to create events that suited my interests. The school was also quite rigid in terms of academics: my year 7 science teacher banned me from asking questions in class because most of them were beyond the scope of the secondary school course. I also recall a certain english teacher marking down one of my essays because my vocabulary was too sophisticated. Apparently she wasn't familiar with some of the terms that I was employing. I explained to her how to use a dictionary. To be honest, I don't really think that helped our rocky relationship...
Sounds like Thor Taylor, except in his case, the school moved him out of the normal maths class and provided him with a special teacher who basically accelerated him to the point of doing Spesh in year 9. Not to sound condescending (again!) or anything, but it sounds to me that your school just wasn't as prepared for you as some others.
In regards to the activities bit, I remember in year 7 they offered us extension groups for Philosophy, Quantum Physics, Marxist politics and Ancient Greek (amongst more "typical" ones), so yeah...
Probably varies from school to school though - maybe one of the private schools would have clicked with you just like MacRob evidently does.