I didn't have an N64, and the only games I played on my PSX were FFVII, Chrono Cross, and more FFVII; after the PSX, I had a Gamecube. Basically, I missed the entirety of the "collect-a-thon" genre. As a result of that, the fervent nostalgia some folks have for DK64, Spyro, Crash, or Banjo-Kazooie is utterly baffling to me. In fact, ANY game with a whiff of "collect 100+ of a thing to get the golden ending!" was an instant turn-off to me, and is likely the biggest reason why I haven't played ANY Mario game post-SMW that wasn't an RPG.
Friends. Kinda. It's not like I didn't play well with others, I just happened to be a loner-type for about half my school years. I got some friends later in high school so I wasn't a complete weirdo, but most weekends were still me at home with games and Internet, for good or for ill.
Friends. The series. Really, a lot of the silly, inoffensive sitcoms other people remember fondly just didn't appeal to me. Friends, Frasier, Seinfeld, Full House... and yet, "Married... With Children" was an utter delight for my rebellious self back in 2000.