And yeah, I realise that knowing how to make a website happen is something that requires additional layers of expertise (a lot of which I didn’t have when I was eleven).
Plain HTML has its limitations. It’s not going to do everything for every use case.
But it sure does a hell of a lot, and there is so much fun you can have messing around with it, even without publishing your page to the web. (And when you’re ready to put your cool, weird site out there, there are plenty of places you can get help with that.)