I think you go through a period as a teenager of being quite cool and unaffected by things.
There's such big pressure on people who are incredibly famous, on those who have people sitting outside their front door and taking photos every time they move.
If there is a book that the script came from you have to read it, you have to see what you can get out of it: mood, back story and things that may not even be in the film. They kick off your imagination and broaden the character, I think.
I think you go through a period as a teenager of being quite cool and unaffected by things.