Everyone in the family knows that I have always been different, & when I told my father that I have Asperger's syndrome, he was upset and in denial at first. He still doesn't like thinking about it, so I don't discuss it with him unless he brings it up. He is also bothered by my being a hermit type person, as he is an extrovert, and has trouble believing that solitary people can be okay with being alone. I prefer being alone, and must frequently reassure my father that I like living alone and that I prefer not constantly socializing with other people. I am in my upper 50s, and he is in his lower 90s, and after all these decades, I still can't get him to understand that some people, including me, like being alone.
As for your problem with your mother, don't keep throwing your condition at her. Just do what's best for you. Most NTs just don't know enough about autism spectrum disorders to understand what it involves. Because of the broad spectrum of traits, and the different levels of intensity that each trait may have in each different person on the spectrum, no two people on the spectrum have the exact same package of traits and intensities. There are also a number of co-morbid conditions that people on the spectrum can have. This makes it very complicated for NTs to understand. It can also be hard for us to grasp at times, so don't expect your mother, or other people to fully understand your situation.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau