Did we mention books?
When you live with your parents they take care of all of the plumbers and plumbing services for busted appliances. In college you take care of them for your apartment. In high school your books are completely free. In college you have to pay a hand and a foot in order to afford your books. For some people this might be the first time they actually value their books.
Enter your money worries
If you decide to go to a four year university then you will be treated to student loans big enough to make you crumple into a ball on the floor. Suddenly you have to pay for your food, your gas, your school, and even the bathroom remodel that you want done. Worrying will never quit. So get used to taking care of your cash and budgeting carefully!