Here at wrong planet and at support groups going I have attended going off topic is common place. It used to bother me until I figured it out that it is probably an autistic thing. Autistic traits and narcissistic traits are similar so Autistic people are often accused of bieng narcissists. My quess is that the tendency to go off topic has something to do with Executive dysfunction.
Getting back on topic anybody self diagnosing as autistic needs to take into account the similarities in traits between autism and a number of other conditions.
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“Self Acceptance is a process not a performance”
“You are autistic enough. And you always have been”
Professionally Identified and joined WP August 26, 2013
DSM 5: Autism Spectrum Disorder, DSM IV: Aspergers Moderate Severity.