Why can't I remember my childhood? how is that possible-it drives me crazy not knowing...?

I do not recall much of my childhood. I have been told things and try to remember but a block! I know a few bad things took place, but many have worse. I had shelter, food, clothes. My dad worked nites and was tired and got so angry-so we were soo quiet, no playing or noise. My mom was kinda cold I guess and don't remeber hugs etc... So? many kids have worse. I did get punished for weird things, like sleepwalking led to me standing in a corner. I feared alot. I shake even today. Got so scared once while being reprimanded I had an "accident" on self and he laughed. humiliation was a theme. Some punishment but certainly not bad enough to make me like this (I was diagnosed w/ Depression, PTSD,anxiety,ADD and whatever DID is? Geez, I was not tortured or anything. Punished for bad yes..the corner, belt,once thrown into the wall and hit my head but was accidental. He yelled at alot, She drag me by hair- BUT all kids get reprimands/punished. So why am I now such a loser, others do fine! weak?