Funny is funny. And if it's good, it travels.

There's just been a couple of moments where - we did the one [ Carpool Karaoke] with Justin Bieber, which kind of went crazy and I think is at, like 65 million views on YouTube .

There were a couple of years where I got a bit lost - I went out too much, I was a bit heartbroken, thought I was a bit more of a dude than I really was. I would love to go back and have a strong word with myself.

Whatever it is, I just loved it and felt at my absolute happiest when I was performing for people. And if that's what you want from a job, then this is the best job you could ever do.

I guess I have a faith. I have an overriding feeling that all of this can't be for nothing. But then I also fully understand that it might be.

It doesn't help anyone to judge their happiness or career by looking at where others may or may not be. Dad said it best: 'All the time you're looking left and right at other people, you're neglecting what's in front of you.If you focus on looking straight ahead, you can take the odd glance at the future.' He's got a way of saying things sometimes that just puts everything into perspective.

You'll always make mistakes and you'll miss the mark sometimes. That's inevitably going to happen, because the best people in the world make mistakes - even people who are brilliant.