Justin Bieber has said that he is just a misunderstood '19-year-old-boy', in a radio interview.
The 'Boyfriend' hitmaker told Ryan Seacrest that his upcoming documentary 'Justin Bieber's Believe' will show how difficult it has been for him to grow out of teen star image to a grown up, in public spotlight, TMZ.com reported.
Bieber added that he is a human being and not a robot.
