was "perpetually" bullied at school.
The former child actress believes moving from England to the US when she was just five years old made her a target to be mocked because she was so different from the other kids.
She said: "I think that's why I grew up so fast
and have always been a bit of an outsider.
"I was in public school in New York where all the kids
were in black jeans and Nike sneakers and I was wearing little stockings and Mary-Janes and perpetually getting my a*s kicked in my bottle glasses."
At the time, 'The O.C.' star yearned to be more popular at school, and found it difficult to accept she was picked on because she was an actress.
Mischa, 24, added: "I still am insecure but young Mischa was terribly insecure. The kids around me at school had realised I was an actress and I started getting teased.
"I wasn't popular so it was easy to integrate me in and out without kids asking too many questions but then 'The Sixth Sense' came out. I would have liked to have been popular. I would have liked to have not been on the periphery so much."