As undeveloped mentally as highschoolers are, they have years more development more than middleschoolers
Middleschoolers are suddenly blasted with hormones, and are basically accelerating at breakneck speed. Everyone's body is changing wildly, you're thinking and feeling new things every day, and it's all a total mindfuck.
By highschool, the hypernovelty has worn off. Yes, they're still developing and figuring things out, but it's not quite as much of the surreal existential body-horror that middleschool is.
Middleschoolers are suddenly blasted with hormones, and are basically accelerating at breakneck speed. Everyone's body is changing wildly, you're thinking and feeling new things every day, and it's all a total mindfuck.
By highschool, the hypernovelty has worn off. Yes, they're still developing and figuring things out, but it's not quite as much of the surreal existential body-horror that middleschool is.