All games:

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PC:
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Some weird game called... ah what was it... Poprockta? Poptropica? Poptrocipa? Something like that.
 
Poptropica, actually that is mine but its not really THAT online imo.
Eh, I don't even remember the name, that should give you an idea about how much I remember about the game. Probably Dog Fighter then (plane fighting sim).
 
TFC, buddy plated it for quite a while. Over his place and he said give it a try. Made me a heavy class, because it's not hard to kill someone as a heavy. Got hooked. 2 weeks later went and bought a new computer just to play that game.
 
Endless-Online I had people talk me into trying it, overall it was a sucky game but interesting at the same time
 
maplestory i think i was lvl 18 and kept taking planes to different places ended up at some crazy castle or something was stranded there only level 50 somethings around me it was terrible stopped played after that
 
I'm not sure if anyone knows what I'm talking about, but does anyone remember CokeMusic?
It looks like this was like an online chat room game.
There was a big trading scene too, like those coke couches were like another form of currency in that game.

Anyway, that was the first online game I can remember playing.
 
Ultima: Pagan when I was six. It was my older brother's copy.
I was rather well developed at a young age, but I never devoted much time to games anyway. I just amassed as much knowledge as I could at the time, reading books and writing essays. Or hanging with chicks. Yes, at 6 years old.