I'm also half and half.
All of my friends and personal contacts know. I'm not afraid of anything with them and there's nothing to hide, because they can't screw my life over because of it. Anyone who doesn't accept it doesn't deserve to stay as a friend/acquaintance. My parents know, of course, because they're the ones who discovered it. I don't have much of a family aside from them.
However, as part of my professional involvements, I usually don't openly disclose. I don't act any different, but I don't openly talk about autism in relation to myself to anyone aside from those who know me from way back and inevitably know that I have it. Because I work in the autism field, it is inevitable that many will pick up on it and at least think of me as someone with many autistic traits. The reason why I am not open about it, though, is because I am an extremely social person and don't want others to assume that I prefer more solitary jobs and don't have the social skills to work with clients.
In fact, I often question how representative the label is of me because my communication and introspection skills are relatively strong compared to most other people on the spectrum I have met, so I can socially compensate through self-advocacy = excellent communication. It's something I've had to learn, though, several years ago I had almost no ability to advocate for myself this way.
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Leading a double life and loving it (but exhausted).
Likely ADHD instead of what I've been diagnosed with before.