Justin Bieber believes fame can destroy people.
The Baby singer believes that once celebrities let fame get to their heads, they start "losing it".
He told Vibe magazine: "What does that really mean, 'To be famous?' In general, fame can tear you apart, so you can never really feel like you're famous. When people start acting like they're famous, that's when they start losing it."
Bieber also said he was very cautious when giving out personal information about himself because there “aren't good people” in this world.
He said to the publication: "I don't like giving too much personal information about where I live and the cars I drive. There are a lot of people in this world that aren't good people, and all they need to do is a little research and then they can.
"People hiding in garbage cans overnight to catch [pictures] of me; crazy things happen. You can't give out too much personal information."
The 18-year-old also revealed that he wants to hold onto his youthful looks for as long as possible – particularly because he dislikes shaving.
He said: "I hate shaving. It's really going to suck when I have to start shaving every day.
"My mom looks pretty young and my dad does, too, so hopefully I will too."