I didn't hate high school at all. Sure, some tough times, it was like a jungle but it was nice. It's there I met my best friends so it was an important time of my life.
I was the teacher's pet with almost all my teachers and pretty much everybody knew me (tough I suspect I was more known as "That weird girl who doesn't dress or act like anybody else").
But when I finally entered university, I realized high school was not half as great.
To start with, even if we had different "section" in high school (scientific, math, latin...) we had a lot of classes we didn't choose, which were compulsory for everyone (like math).
It was also a place where difference was immediatly noticed and easily mocked. All the people I know, including me, changed a lot since they left that school. Some went to another school before the term and went in a more...technic education. And those people literally blossom. Some get a lot of piercing, some get clothed like in a manga, some dye their hair...As far as I'm concerned, I wear the dresses I want to, I wear what I want because I don't have controls anymore. Seriously, they could force students to get back home if they had a capri shorts (boys) or a under the knee skirt (girls).
Everything was also too controlled in my opinion. I'm a well upbrought kid but it's not the case with everybody. In high school, we are really punished for everything and anything. Forgot your book? You lose points. Arrive late? You lose points. Dream in class? You lose points. We also would lose point if we didn't go to school and didn't have a certificate. Which always annoyed me because if you just vomit all day long, if you don't want to lose points, you have to go to the doctor and pay 20$ to have a certificate which says "The student couldn't come to school because of nasty vomit". So I was always going to school, no matter how sick I was (that changed a bit, as it's not punished in university to not come).
I understand that those mesures must be taken when the kids are young and still...Wild (the youngest, the wildest at my school). But once you are 16, 17, 18...It's just annoying to still be treated like a child. It's really since I'm at university I can consider myself a young adult. I have more freedom. I don't go to school because I have to but because I want to. It's a whole different dynamic!