I don't think anyone can give you an absolute answer that will make everyone happy. You may have already seen some of the recent WP threads where even some of us late to get a formal diagnosis are subject to criticism from others on the spectrum that we're not really ASD because of this or that. Just wanting to get an adult diagnosis is reason for some to criticize you. Insofar as the online community goes, I'd probably just identify as someone who strongly suspects he or she is on the spectrum.
Outside of the relative anonymity of an online forum, I'd probably limit your self-disclosure to people that are trustworthy and close to you. Months after my diagnosis, I chose to "out" myself in real life, but before that I only told a few friends about my suspicions. My ex-wife was actually the 1st person to suggest it, although it would be about 10 years before I had the financial means to follow-up.
If a diagnosis is important to you, don't give up. I had a series of frustrating experiences when I began looking for someone to conduct a diagnosis. The first hurdle was finding a place that was equipped to work with adults due to the persistent false notion that ASD is a childhood ailment.
One local counseling center made an appointment for me to be seen by their resident autism specialist months ahead of time. When I called the day before to confirm the details of my appointment, they couldn't find a record of it on their calendar! It was a devastating letdown. I called another psychologist that was recommended to me, but this guy (and I was only allowed to speak to his office manager) wanted me to commit to ongoing weekly sessions until I achieved a "breakthrough" (whatever that means). I tried to explain I wanted a simple diagnosis, but was informed they don't do that. They wanted to "fix" me at a rather steep, ongoing rate. I declined.
I finally found an agency affiliated with the University of Tennessee that was equipped to perform adult diagnoses at an affordable rate (and they took payment installments). I believe it was around US $1,000. That was in 2014, so it may well be a little costlier now. But it was still much more affordable than all the other options around here. If you haven't already done so, you might try calling any universities in your area to see what they offer.
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Formally diagnosed with ASD at the age of 43 (2014), I am the author of "Never One of Them: Growing Up With Autism," available through Amazon and most popular ebook sites.
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