British singer Duffy sings at the Glastonbury Festival 2008 in Somerset in south west England June 28, 2008.[Agencies]

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Duffy hasn't made any money since she started singing. The 'Mercy' singer - who is proving a hit in both the UK and US - admits she hasn't seen any of her earnings yet, but isn't worried about her lack of funds.

She said: "I haven't had any money yet! I think it's something to do with royalties. But at least I have enough money to buy a pair of tights now! "I don't care about the money, I don't do it for that. I do it because I can't not do it. I have a love-hate relationship with music. It drives me mental but if I'm not writing melodies and lyrics I feel ill."

Duffy, 24, also claims she has made a conscious effort not to let her growing fame change her life.

She added: "I'm clinging onto reality. I still want to hang out with my friends and have a drink but I don't have any time. Sometimes it does my head in. But I wouldn't have it any different."