The 22-year-old singer - who is currently single - thinks she expects too much from her partners, even though she never actually tells them what she wants.
She admitted: "I used to think I was such a great girlfriend, but I`m not at all, I have my flaws as well.
"I expect too much. At the time I don`t realise that. I expect too much but never tell them. I`d never say, `Look, I`d really like it if you did this for me.`
"I always moan about it but never tell them to their face. And if someone goes, `Why don`t you just tell him what you want?` I`ll be like, `Well he should be able to pick it up, to sense it.`
"I can be stubborn, very, very stubborn, but only in my relationships. I think everything I do is golden, I think I`m Princess Diana."
The `Chasing Pavements` singer admitted she has a "lonely" sex life and often has to be persuaded to go out by her gay friends.
She added in an interview with Attitude magazine: "All my friends are gay. My sex life`s pretty lonely but I`ve got a lot of drama in my life. I`m like the agony aunt, they`re always coming over my house at four in the morning in tears.
"My mum`s friend was living with me in the summer and they kept trying to take me out. They were like, `You need to get out, you need to meet a man.` "