The fact that I'm autistic.
Sometimes I'm thinking "what is the point of mentioning it?"
and some would probably assume I'm faking it. (I don't have any proof of it. But I got diagnosed with it by a psychologist.)
Also, if I tell people that I'm autistic before I get to know them, then they might have some assumptions about me. (like that they might assume that I'm good at math, when I actually have once failed in a math exam.)
And I often don't tell people right away, if I have just met them.
Well... this thread is a bit random.
Kind of pointless too.