I was 22 and completely finished with my degree. I think if I'd wanted to take college courses, for credit, I'd have to take a full load of classes, and I didn't need nor did I want them (and with the price of $4000 for a full-load semester, it would be cheaper to pay the insurance). I just factored it in as part of my living expenses - mind you, my parents took over the tab for that and my student loans when they kicked in in November, until I got a "real job" in FL the January after (and I definitely had to pay them back). It's all apart of the real world, and I'm grateful that my parents gave me the chance to do the CP when I probably could not have afforded it myself. And I didn't even have a car (at least until December).
That said, there may be cheaper options or you may be brave enough to go on without insurance, but this was my situation based on my parents' policy. I have friends who have lied about their student standing and gotten insurance from their parents' policy. It's all up to you.