There’s r/foreveralone. I don’t know how the community evolved, but like 7 or so years ago it was basically what you described. People seeking comfort over feeling undateable and being scared of never finding anyone, but without the toxicity and hate that incels are known for.
Don’t ask me how I know this.
Vampires Dawn. I haven’t checked out the second and third part yet, but I still think about the first from time to time. I had it in a magazine CD 20 years ago.