I think this is the case for BPD sufferers. I was originally diagnosed as BPD (well technically I was diagnosed as schizophrenic at age 16 then diagnosed As BPD aged about 32 then as schizophrenic again at 35).

I had a pretty traumatic childhood. I was bullied from a very early age. Probably from the age of 3 at pre school. Bullied till I was about 16. I knew there were problems with my parents marriage from the age of 7. They split up badly at age 12. I was quite precocious as a child. I knew my parents were fighting very young and understood it but never could talk to anyone. I knew before my siblings did as they were older than me and away at boarding school. 

I didn't have many if any Friends. I used live in a magical made up world and that was my escape. 

Full on psychosis and delusions from about 14 to 15.

Just wondering if it's common.