This is pretty old, and I rarely post on image boards. I will say while I'd fit the description of "the problem" now one of the only reasons into extreme horror and stuff like this is having met a number of girls of the sort your thinking about.

The problem is that the goth and emo subcultures died out along with most of punk. Or at least as far as being as open about it went.

On top of that you have to remember that the internet isn't the wild west it once was. It's harder to be somewhat open, yet anonymous. Even boards like this are a lot less anonymous than people would like, and as a general rule there is massive potential stigma just from being associated with stuff like this. As a general rule the people you see who will admit what they look like IRL are those beyond caring. On top of that just because someone says they are a morbidly obese, male, basement dweller, does not make it true. The fact that it isn't questioned could very well be the point if someone is attempting to create a false identity.

See, part of your presumption is that a young, attractive, "zoomer", who was akin to one of the girls I used to know would want to make that obvious on a place like Gurochan and have everyone chasing her. Something we all know would happen if the community knew it was real.

To get to the point though. If you want to find people who might be like what your looking for, go into private video game communities. Things like "Conan Exiles" have lots of private adult servers that advertise on various discords and such. There you will meet plenty of actual girls, they tend to actually be some of the weirdest ERPers, and while not everyone is a super model, many are in fact portly older women, there are some young cute ones as well and you can typically tell whose real by listening on voice chat if it really matters to you.

Let's just say I was part of playing out a lesbian sexecution party involving vaginal impalement involving creative use of some custom mods and while I did have a female avatar made for it, I was one of the only guys behind a character (as I was a good RPer and was invited) and a fair number of the girls were younger and seemingly quite insane.

No guarantee of the results, and I don't recommend doing that stuff just to be a stalker, but if nothing else remember the people your thinking of tend to be more video, and interavtive media based now. Something like image boards is too static for a lot of the younger folks. Simply by being what this is things are going to be weighted towards an older crowd now, and well, like it or not, not everyone ages well.