I've definitely met people from the USA with a similar attitude (and actually, come to think of it, some of them have said that they developed the attitude of feeling "the same" as adults, when they joined social circles where they fit in; I haven't seen this process firsthand in anyone, but I have heard some brief accounts of it).
Maybe this is just all trauma stuff for me... a big aspect of (C)PTSD is not learning from experience, and feeling like a traumatic situation is still going on when it's been over for a long time.
