Justin Bieber has apologised to his fans for what he termed his "arrogant" and "conceited" behaviour. The 20-year-old filmed the apology after an appearance on about which he said he was "really nervous" after his controversial behaviour in the last 18 months.

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"Today, I was on and it was a lot of fun. She's amazing, it was her birthday, but I was really nervous. I think I was nervous because I was afraid of what people are thinking about me right now," he says in the clip, which was posted online on Wednesday.

"It's been a minute since I've been in a public appearance, and I didn't want to come off arrogant or conceited or basically how I've been acting the past year-and-a-half."

Justin Bieber made a surprise appearance on

The singer went on to stress that his recent behaviour was not a true reflection of who he is.

"I'm not who I was pretending to be. Why I say I was 'pretending' is often we pretend to be something we're not as a cover-up of what we are truly feeling inside," Justin said. "And there were a lot of feelings going on in there. Just being young and growing up in this business is hard. Just growing up in general is hard."

Justin's video follows a tumultuous year which saw him arrested for driving under the influence and drag racing, and also splitting from his on-off girlfriend Selena Gomez. Despite not previously addressing his behaviour, the pop star went on to say that he does care what people think about him.

The singer has apologised to his fans for his "arrogant" behaviour

"I'm a person who genuinely cares. And although what's happened in the past has happened, I just want to make the best impression on people and be kind and loving and gentle and soft.

"And although people can call me a 'softy', that's how my mom raised me."

Justin, who is currently the face of Calvin Klein, will appear on on Thursday.

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