In the beginning, I didn't want to tell anyone. Even my family didn't know. People wouldn't have understood, because they didn't want to understand and because I didn't feel comfortable with my difference. For as long as I wasn't comfortable with autism and ADHD, I realised others wouldn't be either. How could they? They know less about it than me and if they pick up on that I think it's weird, then they'd adopt my opinion and think I'm weird too.
By now I realised that friends and even some acquaintances need to know about my ADHD and/or autism. And family too. It's a part of my life, so they got to know about it if they are also part of my life.
Besides, I am a perfectly normal autistic person with ADHD. I have to deal with people's “normality” every day too, so why should they not deal with mine? I'd rather people use their heads to think about how we can live together in somewhat akin harmony. Not wonder about why I'm supposedly not normal, because that doesn't get anyone anywhere.
My autism and ADHD are too noticeable to hide. It makes those who associate with me a lot wonder what's “wrong” with me. And since usually, people's musing turn out to be bad and stupid, those who'd start to wonder know what they need to know. Some only know of ADHD, others of the autism too. To each what they got to know, depending on how much they know about the rest of me.
Levels of understanding and interest vary greatly, but everyone important is like “well you're mad as a hatter anyway, we know and it doesn't matter, because that's how you are”.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett