I miss high school(although not all of my schoolmates, I had several bad memories there). And going to college is almost the same thing. Yes there are those who are really immature but that's what makes it fun. And in college, you will get your ass so worked up.
Oh and having difficult classes in high school is normal. In college, it is common to get difficult classes depending on your course
on the teachers,well I think I like them in High School(Have you tried having different Teachers for Integral Calculus and Differential Calculus? not fun, you will get your formulas mixed).
On ditching class, I dunno what college you will go, but in mine, 7 consecutive absences without any good reason(sick, family member died) you will fail the subject. and that sucks a lot.
I tell you, being that lazy in High School, you might suffer in college because it is a whole different world.