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Adam Levine

Stefanie Keenan/Getty Images for Grey Goose Vodka, Seth Poppel/Yearbook Library

Adam Levine may be People's Sexiest Man Alive, but he wasn't always so hot and hunky. OK, maybe he was.

During an appearance on Conan last night, the34-year-old Maroon 5 singer opened up about his high school past.

"How do you process this Sexiest Man Alive thing?" Conan O'Brien asked. "Is it something that you're comfortable with? Does it make you uncomfortable? Share what it's like."

"It makes me comfortable and uncomfortable at the same time," Levine admitted. "It's bizarre and awesome and funny and cool. Who doesn't harbor some secret desire to kind of want that a little bit?"

O'Brien asked if he always felt like he was sexy, even back in the nerdy days of high school.

"It's kind of reverse actually. Now, I'm a lot less confident," Levine dished. "I was delusionally, unreasonably confident. I was a little jerk. I was really into myself."

He added, "I'm not the same way that I was. I had this weird confidence that was bizarre."

"I think we have a picture of you from this era," O'Brien said, before showing an adorable black and white yearbook photo of a teenage Levine.

"Look at that goober in that photograph," Levine quipped at the pic, adding of his not-so-stylish necklace, "I believe that was actually a beaded necklace."