Well, there are lots of little things that can add up really quickly. You’re driving more, so you’re spending more on gas and oil changes and tires. If you have to pay tolls on your commute, that adds up really freaking fast. Ditto if you have to pay parking, as the days of paying $100 a semester to park in the stadium lot on campus are gone. Your parents drop you off their car insurance, so you have to pay for your own policy, which is more expensive than your part of their multicar policy. Plus, since you’re driving more, your rates go up even more.
If you move out of the dorm, you have to have all the kitchen stuff you never needed before. Plates, bowls, glasses, silverware, pots and pans, dishtowels, salt, pepper, mustard, etc. Even if you collect this stuff at garage sales and the Dollar Store, it can add up to a fair bit of money. Same for furniture. You need at minimum something to sleep on and something to sit on, and unless you’re scavenging things off the side of the road, it’s going to cost you some money.
You can’t go around in tattered jeans and concert tshirts anymore, you need suits and ties and heels and hose, or scrubs and labcoats, or whatever. Your office attire needs dry-cleaning, and that adds up. Same for all that stain remover to get the blood and vomit out of your scrubs and labcoat.
You discover that you’re bloody sick of peanut butter and ramen noodles, and you want some real food. Ramen noodles range from .10 to .30 a package, whereas ground beef is $1.50 a pound.
You can’t go to Student Health and take a few days off class when you get sick. You have to go the doctor and pay a $10-$20 copay, and you have to take time off work. If you don’t have paid sick leave, your income for that pay period goes down the toilet. You can’t get antibiotics from the school clinic for $5, you have to go to the regular pharmacy and pay $20. Your birth control pills that cost $6 from the school clinic are $30 now. If you have chronic conditions like asthma or epilepsy or hypothyroidism or depression, your medical costs skyrocket.
It’s mostly little stuff, $5 here and $40 there every month, but it can mount up amazingly quickly.