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Adam Levineadmits that before appearing as a coach onThe Voice, he never considered himself mentor material.“I was this single dude who never thought about helping anybody with their career because I was too hyper-focused on my own,” he says in PEOPLE’s15 Seasons of The Voicespecial edition.Levine, who is currently fighting it out with coachesBlake Shelton,Kelly Clarkson, andJennifer Hudsonto create his perfectVoiceteam, says the most profound thing he learned on the show came early on, when he realized he had an area of expertise.Trae Patton/NBC“I kind of had to grow up a little bit,” says the 39-year-old rocker, “and do a job and provide a service for other people and teach them things I knew and play this crazy game.”The coaches tell all in PEOPLE’s new special edition,15 Seasons of The Voice,available now on Amazonand wherever magazines are sold.HostCarson Dalythinks Levine is “crazy” for feeling like he couldn’t teach others, while Shelton agrees that his prank-buddy had some work to do.RELATED VIDEO:The VoiceOuttakes: Did You Get That on Tape?“Can I put emphasis on ‘grow up’?” he says.

Adam Levineadmits that before appearing as a coach onThe Voice, he never considered himself mentor material.

“I was this single dude who never thought about helping anybody with their career because I was too hyper-focused on my own,” he says in PEOPLE’s15 Seasons of The Voicespecial edition.

Levine, who is currently fighting it out with coachesBlake Shelton,Kelly Clarkson, andJennifer Hudsonto create his perfectVoiceteam, says the most profound thing he learned on the show came early on, when he realized he had an area of expertise.

Trae Patton/NBC

The Voice - Season 15

“I kind of had to grow up a little bit,” says the 39-year-old rocker, “and do a job and provide a service for other people and teach them things I knew and play this crazy game.”

The coaches tell all in PEOPLE’s new special edition,15 Seasons of The Voice,available now on Amazonand wherever magazines are sold.

15 seasons of the Voice People book

HostCarson Dalythinks Levine is “crazy” for feeling like he couldn’t teach others, while Shelton agrees that his prank-buddy had some work to do.

RELATED VIDEO:The VoiceOuttakes: Did You Get That on Tape?

“Can I put emphasis on ‘grow up’?” he says.

source: people.com