Ah, Brenna and Lil Miss...I feel y'all's pain.
I'm 19, three months away from turning 20, and I, too, do not have my learner's permit. Like Brenna, I just never got around to it, I guess. : shrug
But to save myself the embarrassment, here's what I do. Whenever someone asks me and appears startled by my confession, I look at them sniffily and say, "Well, as a member of Greenpeace, I actually believe in protecting the environment and reducing the consumption of fossil fuels, unlike some people."
Trust me, this works every time.
(And meanwhile, get yourself a doting boyfriend with a nice car! )