I don't know if these are reasons, or things that contributed, but here they are. My father was incarcerated for 7 years (from ages 4-11) and I could not see/speak/contact him at all during that time and once he got out my right to see him was constantly being yanked away (I was a minor at the time), I was bullied for my father's incarceration and other reasons in school, (when I was 10 a girl told me she wished I was dead, I was also hit numerous times and verbally bullied), began going to therapy on and off at age 4, attempted suicide at age 10, from ages 10-17 I was admitted to the psych ward 8 times (one time I was sexually manipulated by my roommate, other times staff treated me like absolute garbage), was diagnosed with depression and anxiety at age 11 and put on meds, gained a shit ton of weight when I was 12 so I ended up being a 200lb 12 year old, bullied cruelly for that and being a gay guy (got spit on and stabbed in the temple with a pencil), then I lost 70lbs in 7 months and developed anorexia, got into a narcissistic, controlling relationship with a girl despite knowing I was gay, etc.
I am now diagnosed with Major Depressive Disorder/MDD, OCD, Unspecified Anxiety, and I'm sure there's other shit. So, that, and just a lot of trauma as explained above. Anyone who reads, thanks for listening to some of my sob stories, it's certainly not all of them.