Autism, schizoid and Complex PTSD have a lot of overlap. Growing up undiagnosed autistic in an unsupportive environment can lead to CPTSD. Schizoid can also be thought of as a flavour of CPTSD that occurs if you’re predisposed via genetics. I think there’s still so much to learn. None by themself explain me, but all three together do. CPTSD is often co-occurring in late diagnosed autists.