Cheryl was a ''depressed'' teenager.

The 33-year-old singer - who is rumoured to be expecting her first child with boyfriend Liam Payne - admits she was constantly ''worried sick'' during her school days, and wouldn't ever want to return to the period.

She said: ''Kids just don't have the courage to talk to someone.

''I was just a general worrier, it's in my nature, I would worry about the world, I'd worry sick if I saw something on the news. I was quite a depressed teenager to be honest, I didn't enjoy them at all. Worried about exams, everything. I worried I was going to be failure.

''Your hormones play a huge part in your teenage years of how you feel. I wouldn't go back to my teenage years for love nor money.''

Cheryl is fronting a campaign for Childline to mark the 30th anniversary of the charity, and can ''completely relate'' to the troubled youngsters who use the service.

She added during an appearance on 'The One Show': ''It breaks my heart to think that you're in that much pain that you turn to harming yourself as a release. It's a massive, massive problem.''

The 'Fight For This Love' singer has her own charitable foundation and is thankful she is able to help disadvantaged young people in her home city of Newcastle, North East England.

She said: ''Newcastle is my heart, it's where I'm from. I want to help young people, the next generation, to have hope, have opportunity. I have a centre that is going to help 4000 people per year.''