I genuinely believed no one would want to marry me. I am difficult to live with. I'm selfish, quite weird and I need time on my own to think - and then I work all night long. That is difficult for someone to deal with. And it would drive me mad - I could never be my own girlfriend!

When I think of invention, I always think of America. You're always seeing ads: 'Have you got the next big idea?' There seems to be that spirit in America of inventions and inventors.

I think if you're an unhappy person, you're always going to be an unhappy person. You're probably going to be less unhappy if your business is doing well, if I'm being honest.

At 20, you're cocky and you think you can rule the world, and you get it all wrong.

I don't want to tell a 15 or 14 year old what they should be doing. I want them to tell me. And that's what I got when I met Justin Bieber for the first time.

You sounded like someone who should be singing on a cruise ship. Halfway through your song, I wished the ship was sinking.

I never knew how much love and pride I would feel.