Overlap between autism and personality disorders

I have recently completed some online personality tests. They showed things like I have avoidant and obsessive personality disorders but when I read the description of those, I saw that those were the exact same things I have always struggled with because those are my autistic traits. I wonder if that's a false positive. Is it possible that I don't have these personality disorders but I got these results due to autism or do I have these personality disorders because I am autistic and ASD has affected my personality? I think this would be important to clarify for autistic people since treating personality disorders is not necessarily the same as "treating" autistic traits. Is it possible to change these at all? 

Parents
  • Autism is a developmental delay and the behaviour usually present from a VERY young age. It's often accompanied by learning disability and sometimes mild motor issues (poor balance and/or hand-eye co-ordination) Personality disorders don't tend to start before teens or early adulthood and often a result of environmental causes ie abuse or neglect.

    There is a subtype of Autism now getting recognized more often called Pathological Demand Avoidance. which would also give symptoms of avoidant behaviour. I believe the NAS has a page on it somewhere.

Reply
  • Autism is a developmental delay and the behaviour usually present from a VERY young age. It's often accompanied by learning disability and sometimes mild motor issues (poor balance and/or hand-eye co-ordination) Personality disorders don't tend to start before teens or early adulthood and often a result of environmental causes ie abuse or neglect.

    There is a subtype of Autism now getting recognized more often called Pathological Demand Avoidance. which would also give symptoms of avoidant behaviour. I believe the NAS has a page on it somewhere.

Children