Wow this is a really interesting post!
I'm only 17, but I always feel like I'm in the state of mind of a 7 or 8 year old. I seem to be constantly switching between being a 17 year old state of mind, but then suddenly, I go 7 year old, and wanna watch little kiddy films, and I tune out of everything because I don't find it interesting. When I'm in my 17 year old state of mind, I try to be more sociable and such, as it would be expected of a normal teenager, I try to talk more, and I try to understand people (although I always get tired/upset/concentrating/angry mixed up)
When I was 12 I always thought like I'd been held back mentaly or something, all the other girls like make-up and all they did was talk to each other in class. Me? I ignored pretty much everything apart from the teacher, the work I was supposed to do, and all my drawings and doodles that covered every space available. I had (and still have) no interest in make up, but still, I always felt like my head was a few years back from what my real age is..