"I have nightmares where nobody shows up and nobody wants to see me perform at all. I would just cry. I would just sit on the stage and cry," she said.
The "Love story" crooner also said that despite her success, she is prone to days of self-doubt. But she has insisted that the roar of the crowds at her gigs always cheers her up, reports femalefirst.co.uk.
"My friends and I talk about this all the time; just being in our twenties, you don't know what it's going to be like when you wake up. Not every day is perfect. It's not always sunshine in my brain and sometimes I just wake up with a bad attitude. But I hear people screaming and a switch flips and I'm excited," she said.
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