The Believe artist revealed that he has been mistreated in the past by label executives.
Bieber told GQ magazine: "I keep my guard up a lot, because you know, you can't trust anyone in this business.
"That's what's sad. You can't trust anybody. I learned the hard way."
Bieber last week unveiled new single 'Turn To You', which he released in dedication to his mother.
Watch Justin Bieber's video for 'Boyfriend' below: