i've always had a predisposition to being extremely sensitive. this was not a good combination with how my parents treated me. the thing that affected me the most was how my mom was so awesome at controlling, micromanaging, knitpicking, criticizing, and humiliating me to make herself feel better. it's like she thrived on putting me down. she would take joy in humiliating me- especially in front of other people. she loved it, she would laugh at me while i would cry in utter embarrassment. i could see how authentically happy it made her. who does that to a small child who did absolutely nothing wrong?? that kind of thing is just evil or psycho.
the way she controllingly treated me made me aware that she was watching my EVERY fucking move and she was ready to harshly criticize me, too. everything i did was wrong or not good enough. this instilled in me a certain paranoia that people are watching everything i do and judging me negativiely. it also gave me a low self esteem and i am always insecure about pretty much everything i do. i always look around for some sort of validation just to see if i am doing it right. i can never just feel confident that i am doing something correctly and might even be good at it. i am always kind of holding my breath waiting for someone to tell me that i am doing it all wrong.
so yeah, i think a combination of being biologically predisposed to a shy, sensitive personality plus the over-controlling, emotionally distant, callous environment i was raised created this problem.