@Daisyvodka what you describe could be anything, it's impossible to pin down. Could be autism, a personality disorder or low intelligence or something else. Are you possibly hoping it's intelligence because everything else would be more difficult for you to come to terms with.
If you Google autism misdiagnosed you get a lot of results. Also in the other direction. There was a researcher who said that personality disorders are misdiagnosed as autism en masse these days. I don't recall her name now.
There was a time I thought I was autistic. I fit much of the description. Turned out my nervous system was totally dysregulated and I therefore couldn't cope. I still wasn't a nasty piece of work. Also the way childhood trauma and cptsd presented for me could have been mistaken for something else. The fact that I could make changes and symptoms are less or gone means it was something I learnt as a coping mechanism and not something that was in my genes.
Also, consider a combination of things. Autistic people also have childhood trauma etc. anyway, I think you are too invested in trying to figure out your parent. It takes the focus away from you.