Anastacia was "scared" of her sex symbol status.
The 'Left Outside Alone' hitmaker admits she was initially hesitant of being known for her beauty and says it was a "great irony" when she got diagnosed with breast cancer.
She shared: "It's a great irony in my life that I absolutely hated my breasts and then I got breast cancer. These two little monsters - now I call them my twin set and they are just awesome. Now I'm just so very proud to be a woman.
"I'm extremely blessed - breast cancer brought more femininity my way than I knew what to do with. I had been so scared of it but now I embrace it. At the beginning of my career I was like, 'I'm a sex symbol? Oh my God, eww!'"
The 47-year-old singer also admits she was "extremely innocent" as a teenager.
She told the Big Issue magazine: "She was extremely innocent about the world, probably for too long.
"I didn't really understand how things worked out there, not until my career started and I had to make serious decisions."
Meanwhile, Anastacia previously admitted she "went crazy" for Botox when she was in her 30s.
She said: "I went crazy for Botox in my 30s. I would get it done every three months. But right after my divorce, I realised I needed to stop.
"Now I love seeing my face move. I did it all too early and it was too much. Now I love a ponytail. When the hair is pulled back, I feel like Young-a-stacia."