The Rolling In The Deep singer said that she is prone to 'freak outs' but believes that they make her performance all the better.
'I puke quite a lot before going on stage,' the 22-year-old told British Vogue. 'Though never actually on stage.
'But then, I sh*t myself before everything...The bigger the freak-out, the more I enjoy the show.'
And she insisted that despite her rising fame, she refuses to obsess about her looks. 'I've seen people where it rules their lives, who want to be thinner or have bigger boobs, and how it wears them down,' she said. 'And I don't want that in my life... I have [body] insecurities, of course, but I don't hang out with anyone who points them out to me.'
While she is not dating right now, she said that when she does settle down, she would like to have sons.
'I do get massively distracted when I've got someone in my life, which I can't afford to do right now,' she said. 'Besides, no one treats me as well as I do.
'I've always got on better with boys,' she continued. 'Most of my friends are boys. Like, if I have children, I want five boys. Boys love their mothers whereas girls can be so mean to each other.'