“Glee” co-star Cory Monteith may play a doofy teenage jock, but he was a real-life bad boy in his teens.

“Look, I dropped out of school when I was 14 to go f- – – around with my friends and live a lifestyle of crime and pay no mind to authority figures,” the 27-year-old actor tells Rolling Stone.

Monteith was arrested for criminal acts and being drunk-and-disorderly — including, at one point, stealing a car’s radio.

“I still think any minute I’m going to get fired and be shipped back to Canada in handcuffs for stealing that car stereo,” he says.