Justin Bieber's Bodyguard on Rowdy Fans in New Documentary: 'Little Girls Have So Much Strength'

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Justin Bieber shed some light on what it's like to feel as if your safety is being threatened by a group of rabid fans in the new documentary, Bodyguards: Secret Lives From the Watchtower.

"The first time I needed security, I used this guy named Kenny," Bieber says in a teaser trailer for the movie. "He was actually just a boy of mine who was, like, large. We figured he could scare people off just because of the way he looked. But after a while I really needed legitimate security."

WATCH: Justin Bieber Asks His Fans to Stop Screaming at His Concert

The "legitimate security" Bieber refers to comes in the form of Mikey Arana, who has been Bieber's director of security for more than three years. The trickiest part of Arana's job is discerning when to remain in the background to let his client interact with fans and when to intervene.

"It may sound crazy, but three or four little girls have so much strength that they would literally rip his shirt," Arana says in the trailer. "And if it's a big crowd, you could lose him in the crowd."

According to Bieber, the most valuable thing his bodyguards provide for him is breathing room.

"I say the hardest part is just space," the 22-year-old says. "Having security, it creates space for me. It creates boundaries."

Surprisingly, younger fans seem to present the biggest danger to the pop star's safety, but as his fans age with him, the security team has seen less incidents.

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"As the fans get older and knowing themselves more, they start understanding how to act," Bieber explains. "They actually want to act a little bit more sane so that maybe they get my attention, because if you're screaming and super overwhelming, it's hard for me to kind of connect with you."

In recent weeks, the GRAMMY winner has been scolding audiences during his live shows for their outbursts. On Oct. 17, fans at a concert in Birmingham, England, got a tongue lashing for interrupting the singer-songwriter, who was trying to tell a story.

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"Can you guys do me a favor? Can you guys just relax for about two seconds?" Bieber asked the crowd. "I get it, I get it, but I'm like two feet away from you. And I can hear you. I appreciate all the love, it's amazing. But can you show it in a different way? Screaming is just so obnoxious."

After a spattering of boos, the Canadian star continued to explain his reasoning.

"I get it, it's been in our blood and it's ingrained -- you go to a concert and you scream and stuff," he said. "But if you could just scream after the song, enjoy the song, and then take a chill pill for a second and listen to me speak. I don't feel like I'm being heard sometimes, and it gets a little frustrating. When I'm speaking, can you guys not scream at the top of your lungs?"

Bodyguards: Secret Lives From the Watchtower, produced by Bieber's father Jeremy, is being released on iTunes on Dec. 2. In addition to Arana, the documentary also takes a look at Whitey Bulger's protector, 50 Cent and Lil Wayne's bodyguard and ambassadors under Blackwater.