Up until 4e, DnD (and TTRPGs in general) were pretty much only spread through the game itself. You either knew someone who played, or maybe you heard about it on the internet and you were interested so you sought out a local game shop, something like that. Regardless, your first experiences with what DnD was like (ignoring fear-mongering movies and other negative media) was likely to be from playing it.
That seems to have changed with 5e. DnD media is bigger than it’s ever been. Actual play podcasts and shows are everywhere. Speaking personally, though I had been in lots of LGS from playing a ton of MtG growing up, my first direct exposure to DnD was finding The Adventure Zone (way back when it first started as a “one-off” side thing from MBMBAM). From there, I learned about Critical Role, and it only took a few watches of that before I resolved to actually find a group to play with.
How about everyone else? Did you get into the game because a friend invited you to play, or did you get hooked on some DnD show and decide “I want to do that, too!”
An uncle ran a game back when I was a kid. Remember the old box sets?
He moved away, but left his stuff behind. Guess who was the only one interested in the cool ass pictures out of all the kids :)
So I inherited his stuff by decree that if he can’t even bother to answer a phone call, he must not care. And, he didn’t, he moved back into the area years later and was slightly stoked that not only did the stuff still exist, but that someone was running games with it.
But, at first, it mostly sat on the bookshelf in my room because elementary school kids are hard to get to sit down and play lol. So I’d kinda play by myself.
Well, that changed as my friend group aged up enough to sit down and roll dice here and there.
By high school, I had found a group as a player, and we ran 2ed because that’s what was there at the time. But that group fell apart, and I loved the game too much to just quit, but there weren’t any groups because small town life is like that.
So, I badgered my friends into playing. My best friend had an older brother that ran games in college, and had done a few for my friend during summers. So with the two of us, we had enough “mass” to pull in the rest of what would become my steady play group for decades.
Yeah, since 92, I was forever DM lol.