The Welsh singer revealed that she wants to be recognised for the unique quality of her music and is "disheartened" when reviewers fail to see it.
"It makes me mad that people keep comparing me to Amy Winehouse and Dusty Springfield. It's just labelling me as something else, without any respect for the struggle, the determination, focus or artistic vision that I have," Duffy explained. "It's like, 'Whoa, what's that about? Why would I want to be someone else?' Because I really don't. I just want to be me.
"It's kind of strange and disheartening to be constantly told who I look like, or who I sound like."
However, the star also admitted that she feels flattered when she is compared to her musical heroes.
"You do get some people who hit slightly closer to where I'm coming from," she said. "I got compared to Diana Ross the other day, which was a real compliment. And someone also wrote that I was the female Otis Redding, which really made me feel good because he's a hero of mine."