When I was in high school, I was confused how other autistic people could be trans because I couldn’t understand how they’d have a gender without buying into the socially constructed bit. So me considering myself technically cis-by-default was primarily because of not knowing agender was an option.

In terms of sexuality, I preferred that some people thought I was gay and I had even considered I might be some sort of ace-spec, but didn’t realize horny ace was an option and probably mistook some envy and non-sexual attraction as sexual attraction.