Those are some nice numerals you got there anon.
Anyway, it's because that's the narrative they've chosen: I'm doing everything right, they're wrong for disliking me. I remember seeing a comic a furfag made about the exact same thing, only they portrayed themselves as their fursona. That's what she saw, but imagine what everyone else is seeing: a chick that does these animal thins she thinks are cute, and acts like a fucking cartoon character. How many people are gonna think that's normal, let alone want to hang out with someone who embarasses them like that? Couple that with the sense of rebelliousness people get when they're dumb teenagers, and you end up with this shit. Being self-aware at that age, or any point in life, really, is a thing not many people can do.