On College Your high-school reputation will not precede you. You have to start over to make a new reputation, but you get a clean slate. Homework effort affects your grade, even if it's not checked. Textbooks cost far more than you can imagine. Teaching assistants have far more control over your grade than you can imagine.
Pickles have no calories.
The laundry room is empty on Friday night, and weekdays between 2am and 6am. There will be LOTS of people who are VERY different from you. You will soon learn that they are also incredibly similar to you. Everyone is scared and insecure at first. The key to having a good roommate is to be one.