Being unsure of other people’s reactions to your diagnosis is perfectly normal. Your diagnosis it isn’t anyone’s business but yours. You shouldn’t feel bad for keeping it to yourself any more than you would a diagnosis of flat feet, or tennis elbow. You are doing your job, and it sounds like, pretty well. So there really isn’t any reason you’d need to say anything.
I wouldn’t keep it from people because your embarrassed though, it isn’t something you had any control over and nothing to be ashamed of. By the way, before being diagnosed most of us just think that “this is just the way we are.” Most people don’t get diagnosed until something is going wrong that sends them to a professional. Since you’ve been handling life so well, it sounds like you’ve never gotten that far. You should feel really good about that!