For those of us who grew up before 2000, we somehow managed. I think younger people today will as well.
You had TV, newspapers and magazines - and perhaps more importantly, public libraries. The current generation doesn't, not if you take away their phones.
My high school did offer a computer science class in the 90s, and students who took it got to use the school's computer lab. If your school didn't have something like that, that's a shame, but that doesn't suggest that you should have been able to ignore the presented curriculum and do whatever you wanted.
edit: I forgot the Standard ML book, also from some thrift store. All circa late-80s, early-90s. I still have them all.