The 22-year-old actress, who shot to fame appearing alongside Jodie Foster in "Panic Room" when she was just 13, said she found it hard to cope with being recognised in public.
"People would come up to me when I was eating with my family in a restaurant or something and I would always just curl up into myself in a ridiculous manner.
My family would be embarrassed and it would be like, 'Kristen, what are you doing? Just be nice and say hello'. And I honestly don't know what my problem was.
"I think it's natural that 13 year olds can be pretty insecure, but what's unnatural about it was that I wasn't insecure. I loved talking to people normally. I was so engaged and outgoing. It's just fame. That's what I had a really hard time with," she said.