Canadian superstar Justin Bieber has revealed that he acted out and behaved badly because he was so let down by the people around him. 

During an interview with Access Hollywood, the young heartthrob admitted that he was really struggling for a while and felt as though he couldn't really trust or open up to anyone:

"I was really in a weird place. I was in the industry so young and you have so many people that you lean on and trust... I just didn't have my guard up, so I got my heart broken a bunch of times by friends (and) people in the industry. After a while I was like, 'You know what, I'm not gonna open up to people anymore; I'm just gonna be guarded'."

"I was really about myself for a while and then it just got to a point where I was, like, so unhappy, I was so lonely, I felt so alone. I was so closed off to everyone, even my friends. I was like, 'I can't trust anybody', so I started just acting out, doing whatever I wanted to do."

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Watch a new interview with Bieber here: