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Justin Bieber rose to superstardom in just a few years after being discovered on YouTube, but the teen heartthrob says he still views himself -- and prefers to remain -- "the underdog."

"It gives me and my fans something to do and to strive for next," Bieber tells NBC News Special Correspondent Ryan Seacrest.

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"I feel like, in some ways, I'm -- I am the underdog, Bieber added. "Because it's like there's -- there's people that don't believe like that, you know, I can make the transition from being a teen pop star to -- an adult. So I think that -- yeah, definitely."

During the interview -- which can seen on the Today show and NBC's Rock Center with Brian Williams this Thursday, September 13 -- Bieber also reveals that his next major career goal is to win a Grammy Award.

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