Justin Biebercant be an international pop star all on his own.

Like, when Im by myself and I feel like I have nothing to lean on?

Terrible person, he says.

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Credit: Jon Kopaloff/FilmMagic

So [my friend] went to take my picture, and I mooned him.

And I guess [the guards] thought that I was being disrespectful to the site or whatever.

Thats not what I was doing.

I wanted to smack [the guards] around a little bit, he recalls.

(Bieber previously demonstrated his penchant for showing his ass and stuff ina since-deleted Instagram postthis summer.)

But despite his hesitance to return to his wilder ways, Bieber doesnt necessarily regret about his past.

Its not just me, the 21-year-old says.

If I could go back, I wouldnt really change much.

I think its all my journey.

That stuff made me who I am.

Read more from Biebers cover story over atGQ.