I have no idea mbti-wise what I would have 'tested' as as a child, nor in most cases how I truly came across to others. I only know my internal thoughts and feelings, and how I perceived my life and how I perceived others.
Up til maybe grade school, I was apparently pretty outgoing, and sociable and curious, and would go up to strangers - which my mom tells me used to worry her.
Once in grade school, which is when all the kids start settling into their 'groups'/cliques, I had my friends, but I think I'd definitely quieted down by then, and I know I wasn't 'popular'. But I also wasn't terribly self-conscious or upset by that fact. Even then, I had some really close friends, and that's all that mattered. I was happy. I was always good at school - good at the different subjects, and I got good grades. I didn't have to study much, things kind of came naturally for me. Also, I wanted to do well, and I wanted to get good grades. What I enjoyed most in grade school was art though. I loved doing all of the art projects, and those would be the highlight of my day. Followed maybe by science class. I always liked science.

So in grade school, I was quiet, creative, friendly, wouldn't even think to cause a disruption, and was diligent.
Once in junior high, the huge mass of kids, and running from one room to the next, and just the whole vibe of it - and social competitiveness/cliqueiness of it...really got to me. I posted in another thread, but I was way too sensitive for it - it just ate me alive. I wasn't teased a whole lot, but the few times I was teased (usually by boys, but there were a few bully girls who made fun of me) I really internalized it, and became pretty afraid and intimidated of people my age - it was just a whole dynamic I couldn't deal with, and I became really paranoid of people teasing me, and became really self-conscious. Still always got good grades though, and was also really into music. Bad at gym. BAD at gym.

Of course none of this helped my standing. ;-) But I did have a pretty good friend who wasn't part of my school district (she was the daughter of my moms' friend) - and I'm almost positive this girl was/is an ENTP. We had so much fun together, now that I look back at it!!!
I was still rather a hopeless case in high school. I was always nice to everyone around me, but the fear kept me from making any real connections. So I was a loner. I had one close ENFP friend; another recluse who didn't fit in, in a different way. But that was it. I guess I had a few other friends, but I just had no social skills at that time, nor did I have any maturity/guidance in dealing with myself and my emotions, and being sensitive. Science classes were still some of my favorites, but most of my time was spent in extracurricular stuff related to music. I also always read a LOT, and enjoyed more of your creative artsy type stuff. And then my other interest was spending a lot of time outside, looking for birds. And I still excelled at academics, wanted to do well, and did well. But the whole high school experience was so...disconnected for me...because the fact that I didn't have really any friends, and wasn't part of ANY group, really bothered me. That's what I can remember. Just getting good grades, but being miserable because I didn't have many friends and I didn't feel like I fit in with anyone. In hindsight it was all rather self-fulfilling, and if I could go back now I'd see and do things a LOT differently (wouldn't we all?

, but at the time, that's how I perceived the situation.