People with autism don't only have autism, as for NTs we have other things going on, and some are part of developmental systems, such as the system whereby we develop attachment security.
Research has shown that we have similar developmental trajectories as NTs in that area, so same as for NTs, having say parents who are not able to be very available in childhood, may result in us becoming insecure in our attachment styles, either being overly independent so we don't easily ask for assistance when needed or feel able to rely on others, which also affects close relationships in the future, or else being more dependent than usual, feeling we can't cope unless others help, feeling emotionally vulnerable more easily than others.
So to become more secure in making and keeping attachments to others, many people end up working on this in later life. Being very independent can seem like a good thing for a child or young person, but then in trying to trust and make loving relationships, work on self becomes needed. Often this gradually happens over time in our close relationships, or it may not.
Similarly, an apparently emotionally open person whose carers were unavailable may seem like they have good functioning in relating, but both in youth or later in life may struggle to feel loved and needed, and may be insecure in that area, while also associating a less emotional approach with distance and rejection.
These systems that are developmental are running alongside our neurology, and will affect our experience of and in the world. The issues can be worked on, as many of us do over time, in therapy and in life. We are a mix of developmental and more static systems, I guess. So, the OP could be more secure, for example, and/ or might be more independent than some, due to adopting a more distant attachment style. Attachment styles are part of just one developmental system we have, plus other relevant issues here could be PTSD effects and social and basic needs or deficits in our lives, like nutrition, housing, income, educational opportunities etc.