Jillian Michaels Says She Was 'The Biggest Loser' On 'When I Was 17'

'I was always a real loner in high school,' she says on the show, airing Saturday at 11 a.m. on MTV.

These days, Jillian Michaels trains and motivates contestants on "The Biggest Loser," but back when she was 17, she admits that she wasn't all that motivated to hang out with her fellow classmates. In fact, she said, she was "the biggest loser."

"When I was 17, I was just trying to power through high school. High school was tough for me," she says in the upcoming episode of "When I Was 17," which also features Pete Wentz and Ludacris, airing Saturday at 11 a.m. on MTV. "In my freshman year of high school, I [was] still chubby. I had a nose like a softball on my face, a mouthful of braces, acne, a mono-brow."

Michaels said she didn't really get invited by the cool crowd to hang out very often. "I was always a real loner in high school. I never went to one football game, never went to one party," she said. "I was the biggest loser ... literally."

So instead of hitting up the pep rallies, proms and homecoming dances, Michaels found her own afterschool activity, even if she wasn't particularly good at it. "I began looking for jobs. I became a waitress," she remembered. "I was the worst freakin' waitress in the world. I was not very good at customer service. [I was like,] 'Oh, you don't like that? Sorry.' Waitressing was not for me."

"When I Was 17" — this week featuring Ludacris, Jillian Michaels and Pete Wentz — airs Saturday at 11 a.m. on MTV.