I feel a responsibility to the fans who have paid to see me and I want to give as good a show as I possibly can.

When I am with my family, then I can just sort of switch off. It's kind of weird, because I go back and I go into this bedroom that I have had since I was a teenager. It is like this parallel universe, because one minute I am on the red carpet and then the next I am hiding out in this room I have had since I was 15.

Music can tear me up inside.

But I was always much more interested in reading fashion magazines than I was music magazines when I was a teenager. Just that sense of romanticism and escapism and the dream of it has always been quite alluring to me, as well as that sense of becoming a character through clothes.

At the beginning of my career I was going through a really weird phase of dressing in boys clothes. I would only wear one American Apparel T-shirt and shorts and brogues the whole year round. Not the same T-shirt, obviously, but one style of American Apparel T-shirt. I think I was going through a tomboy stage.

The release of 'Lungs' was so hard. It was terrifying, because it was the first time doing everything. The first experiences of media exposure were almost paralysing. I spent a lot of time crying on the floor of the studio - it sent me a bit mad.

I definitely have a real self-destructive streak.

When making the first album, I think I wrote a song about every six months. The first album was so much about the vocals carrying it.

I was having a conversation with my father and he was talking about this thing - strangeness and charm. It's actually the name of the two smallest particles that there are when you split the atom, so I wrote a song around it. I even managed to fit the word 'hydrogen' in there. Isn't that a nice thing for scientists to call them though?

Bono told me how to dance in high heels and he also told me about U2's Glastonbury performance and how everything that could have possibly gone wrong went wrong, including him ripping his trousers on stage. I think he was lunging and his trousers ripped! He was telling me how he had to find a new way of performing that didn't involve moving.

I have this sensation of being in flight all the time, but being on stage is like creating a sanctuary in which you can completely lose yourself. The bits of your personality that you keep under wraps in ordinary life, you can let them run free.

I didn't want to become a personality, I wanted to be a musician, but because I didn't have an album to stand by yet it was hard for people to see that. But now, two albums in, I'm happy with things.

I got to live out my 11-year-old fantasies - I got to go on stage with Green Day. Billie Joe called my name from the stage. 'Dookie' was the first album I ever bought. I covered the whole of 'Nimrod' and he'd heard it. That was like the 11-year-old girl dreamed.

My siblings and I were friends with the boys who would become our stepbrothers - we grew up on the same street. I feel very special to have these amazing people in my life and if we hadn't all moved into this big house together I think I would have missed out on that, because we would have drifted apart.

If you asked me to go back to being 14 or 15, I couldn't - it was a terrifying time. I was so awkward in my own skin. I used to hide behind my hair because I was so ridiculously self-conscious.

The first album, for better or for worse, was done over from the ages of 17-22, with a couple of different producers. Some of it was recorded in an old swimming pool, some of it was recorded in a synagogue - it kind of was all over the place.

I'm pretty obsessed with Stevie Nicks from her style to her voice. I like watching her on YouTube and her old performances, the way she moves and everything.

I made music with my friend, who we called Isabella Machine to which I was Florence Robot. When I was about an hour away from my first gig, I still didn't have a name, so I thought 'Okay, I'll be Florence Robot/Isa Machine', before realising that name was so long it'd drive me mad.

I'm really careful with what the music gets put with, and we say no to so much stuff, loads of it, for things that might quadruple the sales of my album. But if it doesn't fit then it doesn't fit, you know?

Look, if Givenchy is going to lend you a dress, I'm not going to turn it down. I would wear that dress to just go out and buy a pint of milk if they would lend it to me.

I like to wear clothes that I will wear when I am an old lady.

I used to dress like an eight-year-old boy. Traveling has inspired me to be more experimental.

I've built my wardrobe color palette around red, so I'm happy with it, but I do get pangs when I see beautiful brunettes. I've already been blue, green, black, and blonde.

I love that sense of release as you throw yourself into the crowd as hundreds of arms are carrying you.