That's why I added in the "As long as you don't act like 90% of the population and use it as if it's a credit card, rather than as if it's a debit card, then there's no reason not to get a Credit Card and get one as soon as possible" at the end.
I'm nineteen and I have multiple credit cards already and over a 10,000 credit line and I don't even have a job, a house, a car, or anything.

Doesn't matter what a CC charges, most of mine charge 30%+, simply pay it off at the end of the month every single time in full. It'll make your credit skyrocket and it'll give you 2-10% everything you purchase.