I think my anorexia was to do with being a teenager, not being in films.
Everything, I think, about acting is based on imagination.
As a teenager, my favourite rejection was, 'She looks too healthy,' which of course translates as, 'She needs to lose weight.'
Unless it's a specific accent, or something about physicality you have to change, I am generally not such a conscious actor.
What you feel is important may not be what the director feels is important.
I think the main reason a lot of child stars don't make it is that it's hard to see someone as cute and then all of a sudden see them as having more depth.