I joined over 10 years ago, and mainly lurked - at first enjoying all the Nintendo stuff, but then migrating into the Chit-Chat board and then pretty much staying there for a few years.
I didn't post much, as i generally felt intimidated by larger individuals.
Then i went to Uni, and stopped posting. Mostly i didn't have time, but also i thought that i was probably too old for that sort of thing and so i stopped logging on - only returning once i year every time i got that birthday email...
Anywho, a year or two into my PhD, and i noticed i had a bit more time than i used to, to browse the internet, and my curiosity got the better of me, so i logged in again, and was quickly welcomed back. Which was nice. I was surprised by how many people did remember me.
Once i realised that most of the regulars on here weren't little kids, and had actually grown up like i did and continued to post, i stopped worrying that i was too old, and dived right in.
I no longer am inimidated by other users (as i know that i'm better), so i post a lot more.
With regards to Jimbob's post about acting irl, i act on here like i act with people i only know very well in real life. So i suppose that's a compliment.
EDIT: @Iun. That feeling runs both ways.