This is a little funny to me, because I'm almost the opposite: the first time I lived in a house which had cable was when I was in the eleventh grade, because my mom and dad weren't willing to pay for it. Before that, I only got to watch cable for, like, three weeks every other summer, because my biological father used to work for the cable company after he got out of the Navy, and had his own black box.
I'm legit surprised that you've never heard of USA, since it's one of the biggest cable networks that exists: its market share is roughly equivalent to that of ESPN, and every cable company in America carries it. In many markets, it's even included as part of "basic" cable these days. It's been under the NBC Universal umbrella since 2004, so they show some NBC shows in syndication (primarily the Law and Order franchise), as well as original programming (in the pre-Netflix/Hulu era, USA was the exclusive home to shows like Suits, Monk, psych, White Collar, Burn Notice, La Femme Nikita, etc.). And, in the pre-Peacock era, it was one of the handful of networks where you could watch the non-marquee Olympic events in real time. The network actually got its start as the original MSG Sports network and, to this day, they continue to have a presence as a place to watch non-marquee sports (like the aforementioned League One Volleyball, shout out for bringing it full circle!).
Based on the age you have in your profile, the programming that would have been most relevant to your interests during the last year you lived in a house with cable would have been the USA Cartoon Express, which came on twice daily, before and after school (USA had the American broadcast rights to the Hanna-Barbera library until Ted Turner bought it in 1992 and founded Cartoon Network). You may have also been interested in Calliope, which was USA's bootleg version of Sesame Street (the same way Pinwheel was for Nickelodeon).
They also have wrasslin', which is what's made it most relevant to my interests.