Though I have went through everything on your list(except the parents putting me down--I do have a grandma who puts me down alot though and some other family members but that's not QUITE as bad since I dont actually have to live with them--I haven't been through much violent abuse either but some girls at school basically tried to kill me once) I don't think any of it caused my SP...because I've always been this way...for as long as I can remember, I've always been a quiet, nervous kid who didn't want to be around other people, except my parents. I actually think it was the opposite for me...instead of bullying & abuse causing my SP, I think my SP is the cause for me being bullied and put down, etc...