Sounds like me as a child for the most part. I did not have a lot of friends, I was always the weird or odd kid. But I had quite the imagination and I was really resilient as far as the belittling I would receive some days. Although it was still with me I would not let it bring me down for the most part. When I was in kindergarten I was always behind the other kids in everything, but it was really strange to me now reading back on it. My mother tells me now I was a really intelligent kid, but man I was dumb as a rock when it came to school subjects. Pretty much the only thing I was good at then in the early grades was spelling. I always was above average in that area but that was about all. my early school years were hard, especially after 2nd grade, I could not stay in my seat or do things silently, or if it was quiet time in the room, the silence drove me up the wall. I could not stand there not being some kind of sound. I was put on contracts, my father would come in and sit with me etc etc. I had real self confidence issues though at the time. I had no trust in my own abilities and even now I still do not trust in my own abilities. On my report cards I would get negative comments saying I would not be doing my work or leaving other kids alone etc etc. Then there some in the same year as the negative report cards giving me positive feedback saying I was staying on top of my work. doing better on my own etc etc. but this was always a roller coaster.
As far as the sight,smell,touch thing goes for me, if I feel certain fabrics its like my hand has just been infected by a disease. The feeling I get if I brush something I do not like with my hand can throw my whole day off. Smells do not really mess with me to much. But If I see people doing things I find really humiliating even if I am not the one doing it, it is like my world has coem to an end, or if I hear certain sounds I cannot ignore it can throw me off. My father does not understand it and always says its no big deal, but my reactions to certain day to day things are off the charts for normal but I cannot help it. It just cause such intense feelings and I really cannot put a point on where or why.
I have seen various psychiatric professionals, but mostly after I turned 18, none before, The most recent ones wanted me to get tested for adhd,ocd,anxiety,depression. So who knows. Just gotta be persistent and plug away to find the right doctor who will listen and understand you and help you solve the mystery of yourself.
Well I pretty much uselessly rambled here, go figure. I hope you can pick something useful out of this, if not shove out of your brain and carry on