autistic pickle! socialising facebook

I went along to a meetup for an interest in vintage styles and bottled it and left due to social anxiety. 

anyway, the group have a facebook page, and I joined it a few times, but due to other circumstances I restarted a fresh facebook a couple of times over the past few years and closed down my old ones. This was due to some private trauma. 

I now have a new facebook and the trauma I mentioned is over, but the admins will not put me on the fb page, and I was hopping to attend some of the events later this year/next year. it is the only local vintage group there is. I think because I started off on the wrong foot due to having re-started a new FB several times (not that many maybe 2 in total and my current one equals 3) that they must have gotten sick of it or something. 

I had even purchased two handbags from one of the admin at the beginning of this year so she does know who I am. 

When I noticed that they were not adding me for some reason I messaged them telling them I had been through trauma but wanted to keep the trauma private, and said that this is going to be my perm fb page and apologised that I was having to ask to join again, and that I was very much looking forward to attending a future meetup. 

 I wander if they think it is strange that I left that time in the past in person (it was an afternoon tea thing and I just got nervous and left).

But if I tell them that the social anxiety is part of autism, then I worry that I would feel exposed as I usually do not come out as autistic as I am a very private person. 

any advice?