It gets even weirder when you hit "thirty years ago" when you speak of your experiences in Fandom. Take it from one who can scare herself remembering that she had her first fanfiction published in a Trek zine in 1975, and first went to - and worked -- a Trekcon in 1977.
I started a high school Trek club in 1975. I made a couple friends and we didn't get beyond four members. I've never been in any Trek club very long, maybe because they just weren't much fun. The Dr Who fans are a bit looser and funnier, while still appreciating the serious side. I say that even though the original Trek is probably my favorite series, especially year one. My favorite fandom now is DS, followed by Dr Who.
I've never been to a Trek convention. I heard bad things about Creation cons.