Speaking to US Glamour about her annoyance at being labelled, she said: "The frustrating thing is that if I was with a guy right now, I'd be [considered] straight. But If I was with a girl, I'd be 'gay'."
She went on: "When I was with my ex-girlfriend, I used to take her around and say, 'This is my girlfriend'. People would be comfortable with it because I was.
"That's what annoys me about the media. I've never tried to make [my sexuality] something that's going to put me in newspapers or magazines. I'm never, ever going to let it be something that sells my music. Sexuality shouldn't define you. It should be part of who you are."
The singer also denied claims that she is dating rapper Tinie Tempah, saying: "At the moment I'm single, and I'm happy and learning about myself. Music is the love of my life right now."