Justin Bieber [Photo/Agencies]

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The 'Confident' star says his second documentary film, 'Justin Bieber's Believe', shows how he has risen back to the top after being "bullied" by the media.

Speaking to radio show 'On Air with Ryan Seacrest', he said: "People don't get to see me living as a 19-year-old boy. I'm still finding myself and when I have the media attacking me everyday, it's no [different] than bullying that happens in school.

"I think this movie really shows who I am as a person ... of course I make mistakes growing up. And I'm not perfect ... people forget I'm a human being [and] I have to make mistakes and grow stronger."

Justin - who has had an eventful year which has seen him criticised for spraying graffiti in Brazil and getting into trouble for swearing at customs officers in Australia - also said he uses his large collection of tattoos as a way to express his feelings, although he admits getting them inked always hurts.

He added: "My arm is pretty much filled up now. It's a way to express myself a little bit, little moments in my life I go through.

"I've gone through about eight to ten sessions of about two hours each of work. Each time I get them I'm always thinking 'Man, what was I thinking, I don't remember this [pain] last time.'

"I design them myself, each one and the placement. I'm really an animal guy. I feel like my expression is a tiger, that's why I have a big tiger."