1982, I was 12 years old, playing with a group of six school friends of a similar age. Moldvay Basic was my first rpg experience, and then AD&D, which we played as if it was BD&D but with monks, assassins, etc. We played a wide variety of rpgs such as Villains & Vigilantes, Champions, Traveller, Melee & Wizard, Call of Cthulhu and many others. The first rpgs I actually owned were Star Frontiers and RuneQuest, it was quite a while before I owned any D&D material. We played oneoff adventures or short campaigns (12 sessions at most, I think). Back then, we never used mega-dungeons or played in long term campaigns so we never actually played D&D as Gary intended. Our best games by far, imo, were two V&V campaigns.
The biggest influence on all of us was probably White Dwarf magazine, issues 30-60 or so. Probably the best rpg mag ever, far superior to Dragon imo. It basically taught us how to roleplay.