She was speaking to the News of the World newspaper.
"When I was 17, did I think about doing something nasty/" she said,talking about the torment she went through.
"It was all psychological,I was damaged, I also had to go and see a doctor who gave me treatment."she revealed.
She addressed other victims of bullying in the interview urging them to get professional help.
"You musn't be afraid to do that.It's not a sign of weakness.It gave me the confidence to fight back.
"In my case it was a small group of teenage girls" she revealed. "They are the worst kind. It can really hold you back and damage you. Mental bullying is the worst kind of bullying. "
She also ruled out any love affairs in the immediate future.
"I get cheeky approaches but I' just ignore them.Who'd want a nag like me." she said.
"I think I'll skip having a man in my life, my job is to sing."