I've been out of college a looooooong time, but here goes.
You know you're in college when:
You are flying home to visit the 'rents, and you get to the airport by spending 45 minutes on the T, rather than 10 minutes in a taxi, because the T only costs 85 cents. (I'm dating myself here.
)
People want to befriend you because you have a car.
You have a friend who looks kinda sorta like you, who will lend you her ID so you can buy booze.
You learn to cook real fast because the cafeteria food makes you barf. (Aramark SUCKS!)