[cynical mode]
ASDs don't sell drugs.
[/cynical mode]
...and welcome to AC.
This is equal parts funny and tragic, but sadly I think it's very true.
Just like you, years ago, I thought I was reading an autobiography that somebody would have written without me knowing. Except I'm female, so that may have accounted for diagnostic lapses. I suppose many so-called specialists have theoretical knowledge --not all of them, of course--, and some will discard anyone who is not a textbook case.
In my case, when I read my results, I was one point past the cutoff in communications skills, but that's really what I project more than what it's like inside. It also shows we can learn and adapt, I think.
As for doctors misdiagnosing us for countless other things, this takes us back to what Crossbreed wrote. It's just not a condition you can sell expensive drugs for, so why bother when you can diagnose something from the DSM that results in a prescription for a super expensive drugs? At least it keeps drug manufacturers happy...
I've been on antidepressants and antianxiety drugs for years, to no avail. I've even spent a year on a brand new drug to treat schizophrenia. Spoiler alert: I'm neither bipolar nor schizophrenic... and it's fair to say anyone who struggles so much with being accepted in society, and deals with rejection on a daily basis, would have anxiety.
That being said, I wonder if the fact that many specialists are NT doesn't play a part, too. They'll think of whatever is part of their world first... and maybe don't understand the nuances of ASD like we do.
Long story short: welcome, you're in the right place!