I've been into roleplaying games for more than 28 years. An older cousin of mine introduced me to them with The Dark Eye, a cult classic game that curiously came from the Land of Board Games (aka Germany). I was 11.
From then on, I started dabbling in creating makeshift RPGs to play with my few close friends, then in Senior High (I hope I get the equivalence right) I tried joining the school's RPG club (it was called ADT, for Advanced Delirium Tremens), but I never really got along: my general awkwardness and social cluelessness was at play. But, parallelly, I played a nice campaign of Rolemaster with classmates I got along better with. And I've been given Paranoia as a Christmas present, so I mastered it with the same classmates.
Paranoia is a fine game to learn how to master games, if you tend to be too kind to your players: it teaches you that you can be unkind (and even unfair) in interesting (i.e. funny) ways.
But it's after high school that I really got into it, when I joined a club of crazy passionate RPG players. We would play every Saturday from 2 pm to 6 pm for a first game, then after a pause from 8 pm to midnight, and then from midnight to 4 am. After which, many of us would migrate to an early bar for some coffee, hot chocolate, viennoiseries, and would improvise more games in the bar, sometimes until late in the Sunday afternoon. Fun times. I still see a few of the players from those times with various regularities. One of them texted me this very afternoon so we can hang out (I named it elsewhere on this forum as my friend Nao).
I'd be hard-pressed to list exhaustively all of the games I've played during that period, but there were the original Star Wars RPG (with the system that has since been called D6 Legend), the original Star Trek RPG (epic campaigns with my Caitian starship pilot: I played her fickly arrogant and sweet at the same time), various settings of the Old World of Darkness (mostly Vampire: The Masquerade and sometimes Werewolf: The Apocalypse, but Nao made some bitchin' Wraith: The Oblivion campaigns, and later on I mastered Changeling: The Dreaming, and I'm still fond of it), Shadowrun of course, Call of Cthulhu, Warhammer, and some others you probably never heard of, like Thoan, Shaan, and...
In Nomine Satanis/Magna Veritas, the original French game Steve Jackson Games' In Nomine is based on. By what I read, In Nomine tends to takes itself waaay too seriously compared to INS/MV. In the latter, I've always tended to play angels if given the choice. I simply find the petty rivalries among demons less interesting than the philosophical conflicts between angels about what is Goodness. I mean, there's an Archangel of Inquisition, for example. He doesn't get along very well with some other, more gentle and forgiving, archangels.
I could go on more, but that'll be for later, I'm tired.