I'm not entirely sure.
I suspect it began very early on... my mother abandoned me at birth. My father was overwhelmed and not very present (guess he mentally checked out sometimes). There was a sense I was too much work, maybe even unwanted. I got passed around a lot.
I spent 5 years of my childhood not allowed out, except to go to school. I wasn't permitted contact with other children.
Praise was an unheard of thing for me growing up, it didn't matter what I did. I could get straight As for a year without any acknowledgement. I could be kicked out of school without any real reaction. It was almost like I was invisible a majority of the time. I would receive beating for random unpredictable things, I would say they were truly unjustified. I lived in fear of adults. I wasn't clear on what did or did not constitute a beating. I lived in a constant state if heightened alertness/anxiety. I tried to be flawless in my behaviour in order to be left alone or at least not humiliated.
Since I did not have much human contact at home, no real conversations of any kind, I struggled making friends or getting along with people at school. My solution was to remain largely mute, since that is what I was used to and what was expected of me at home. We never did anything, so I had a very limited experience of most any kind of interacting. I talked so little the muscles around my mouth were weak. Talking was hard and I didn't feel I had anything to contribute.
I was also raised in extreme poverty, things like milk and meat were luxuries and treats. I was aware that I was deprived compared to others. I didn't really have any reaction about it, I guess I somehow believed it's what we deserved, we were not as good or intelligent as other people, that's just how things were, period. I was emotionally shut down by the time I was 7 probably. Being too reactive meant you were a target or might get harmed. I tried not to care about anything at all, life was gray, full of disappointments.
Those feelings of inferiority and deprivation remain with me today. Although faaar less severe than the feeling used to be. If any feeling came out at all, it was often anger. I was angry at the world. I was very unhappy. I lived with a lot of shame about my circumstances. I knew I had not led the life others had, that I'd grown an impregnable shell. I wasn't able to be as free-spirited, relaxed, able to easily connect with others, the way other people could. I didn't have enough experience of this. I spent too much of my formative years afraid for my safety.
I got through the misery fantasising about receiving attention, being praised, having all the things I didn't have but wanted... I guess this is all textbook stuff. I only really stopped that when I became in control of my own life and left home for school.
However, lots of other people grew up this way, and turns them into someone especially well adjusted compared to the average, because the deprivation they experienced made them throw themselves into becoming the opposite.
What is the fine line of difference that makes one individual go one way, and others the opposite? I'm talking about open sympathetic people, versus shut down aloof people.
Has knowledge of the causes of your traits helped you? Did it make you avoid the programmed reactions you'd lived with? Did it help you make sense of things? I'm trying to figure this all out... comments, thoughts, analyses, whatever you want to contribute are very welcome.