Don't rule yourself out. I was an art major for a reason and though I *occassionally* do a voice here and there, that is at most 5% of the total stuff I'm doing at a table when I run. Despite that, I still have a waiting list for my games and am the primary DM for most of the people I play with (
@docsilence's game notwithstanding). You can be a great DM without either of those talents. Enthusiasm, a sense of fairness and drama, and a feel for your players will take you as far or farther than any system wizardry or acting chops.
At the very least, give it a try for a few sessions. If you don't dig it, absolutely don't torture yourself, but trust that great DMs come in all flavors.
I really, truly believe it's because many people, especially folks getting into the hobby in the last 8 years, come in on D&D and it is just not a fun system to learn. Spell slots and spell levels are counter-intuitive. There are traps in character building where you can make mechanically terrible characters without realizing it, and even things like your stats are numbers that, most of the time, have no actual bearing ont he game, they're just an index by which you get your bonuses.
And like, learning D&D takes so much effort that folks are just terrified they'll have to do that again. But many games, I dare say most, are easier to learn and more straightforward. Some of it is just people don't like any discomfort at all, so they won't try anything new, but I do think D&D specifically makes the problem worse.
That said, if my group wants to game and they aren't willing to DM, that means I'm driving the car and I'm going to pick the music. I try to pick stuff I think they'll be into, but I'm not spending the rest of my days as a DM only playing D&D. We're gonna branch out just for my entertainment.