I didn't start with D&D - the first TTRPG I ever played was Earthdawn (1st Edition) - but once I discovered (A)D&D(2e) a few months later I was hooked for years. This would have been ca. 1993. And while I say AD&D 2e, in truth it was a mashup of 2e, 1e, and Basic material - i didn't even realize there was a real difference between 1e and 2e until I'd been playing for a year or two.
I played other stuff alongside it; mostly World of Darkness games but also a bunch of little indie games, most of which more or less aped D&D so I'm not sure if they count, plus Toon, the original Marvel Super Heroes, and original Castle Falkenstein. The high school I attended at the time was on a college campus so I had access to all the college-aimed stores, and it ruled. I ran an Alternity game or two in the late 90s, too, while living in a different college town.
I stopped playing entirely for a few years from 2008 til 2012 ish, picking up again with Pathfinder organized play games, which again are close enough to D&D that I'm not sure it counts as a different game.