Exactly Tazer, feeling "odd" is a great term. Feeling "odd" when you are a child can be a big issue - aren't they all when you are a child?
Perhaps it was when I read the book (in my 40's) that combined with the fact that I changed when my older sister started showing signs of a mental illness and was acting out extremely badly. Mom still gets upset thinking about it today because she and the other adults in my family could see (and tried their best to stop) the way I changed, I had to be to the peace maker, the perfect child, everything I did was to conteract the pain my sister was causing my parents.
And I know you read the book because you offered your copy to your child

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Kind regards,
Dickons