The amount of neglect suffered and the numerous and severe social and emotional consequences of the neglect.
I don't create emotional bonds with people. I can't love or hold grudges, and I have an overwhelming need for attention and parental affection (I have no real parents though). I cope with MDD extensively, but I also cope extensively with regressive behavior when alone, including paraphilic infantilism (i.e., I have an obsession with the concept of being a toddler and the physical, social, and emotional contexts, objects, and treatment that comes with being that age, especially with the affection they tend to receive).
I also tend to attach myself to everyone instead of to family members, and I have no real feeling of empathy, even though I always wish the best for everyone.