Justin Bieber: What's Difficult and Amazing about His Life

It's been quite a few weeks for Justin Bieber: while most kids his age relaxed on school holidays, the 16-year-old chatted with Jay Leno and David Letterman, visited American Idol, rocked the White House Easter Egg Roll and - oh yeah - landed at No. 1 in the US with his album My World 2.0.

"What I have is a once-in-a-lifetime opportunity," Bieber says. "And I'm having a blast."

The singer opens up about his rise from YouTube sensation to pop star and admits that having such a busy schedule hasn't been good for his dating life: "Right now, it's difficult 'cause I'm traveling so much," says the single singer.

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Even with Bieber Fever spreading across the globe ("It's like Beatlemania," says the singer's road manager and stylist Ryan Good. "Mass hysteria. Loud screaming, crying, passing out. It's amazing."), the pop star remains grounded.

"I still feel regular," he says. "You know, sometimes it's weird that I go places and I have thousands of people waiting for me, but I always think, 'I'm Justin' "

The Making of Baby

For more on Bieber, see this week's WHO Magazine, on sale Friday, April 16