My parents never found out my actual diagnosis.
About the time I was 5 I started showing pretty severe emotional impairment. I had my first extreme panic attack at about 7, I think. It lasted for nearly a whole week that I was constantly crying. I had been bounced around in a school that didn't want to handle me, so expelled me, and to a few therapists.
The diagnoses were bipolar disorder, anxiety disorder, and ADHD. These were wrong, except anxiety.
I grew up a lot during middle school. I was in a great program that progressed my social skills incredibly and helped me control my emotions. Too well, actually.
Through high school is when the sociopathic tendencies began setting in. My parents often neglected my emotional needs, blamed me when I was the victim, and my father was sometimes physically abusive while my mother did nothing. Then my dad was diagnosed with MS and my mother with brain cancer. My long term romantic interest decided she didn't need me anymore and two of my three older half-sisters stopped communicating with my family. My little world was falling apart.
I began using my emotional control to completely cut myself off from emotional stimuli. When my mom died I didn't cry at her funeral until my father became verbally abusive towards me. I became very cold and manipulative. I learned how to control people, although at my present state of those skills I look back and think I wasn't that good at it.
Borderline personality began settling in strongly in my early twenties as I cut myself off from family, and my wife continued invalidating what emotions I had. My wife would say I was cold, I never cared, I didn't seem to be empathetic with anyone. She wasn't wrong.
Other things happened that I won't go into, but by the time I divorced my wife I displayed very clear signs of severe borderline personality and sociopathic behaviors.
I saw a therapist a few months ago and was "unofficially" diagnosed for reasons.
My parents never found out my diagnosis as I don't communicate with my father, but I know the issues while they formed caused a lot of stress. My father's abuse was both a reaction and a cause.