Hello and welcome.
It would make sense that the word wasn't known in the 80s, it wasn't around then. I think the asexual community only started in 2003 and after. I'm glad the years of not really knowing haven't left any negative impact on you - well, any that you've mentioned.
Yes, this website is rather quiet but it would be fair to say that it's about the quality and what's posted rather than the amount of posts. I'm not saying fast discussions are bad but sometimes it's nice to take part in something calmer.
Anyway, welcome. I hope you enjoy your time here.