I'm...uh.... pretty sure those numbers you provided are neither hundreds nor millions....? They're thousands?
I guess I could have said "possibly as many as tens of thousands of years"? 🤷♀️
Either way the point was the selective breeding, not the duration of time it took to achieve
So, based on your description and the pictures, here's my take:
Your family is unhygienic and gross. Water leaking from surfaces can pick up all sorts of gross stuff. Leaving food waste (I see banana peels I think?) out and exposed to open air leads to rotting and mold which can definitely make you sick. Used toilet paper with fecal matter on it left in an open trash can? HELLA gross.
BUT
Your reaction to this environment is going too far. Disinfecting your phone constantly? Concerns about people spitting in the trash? Not eating any leftovers or drinking from any container you didn't open yourself? These are going too far. As others have pointed out, some contact with germs is important to maintain a healthy immune system.
There's a middle-ground that both you AND your family are missing.
Wash your hands after using the bathroom and before eating, sure. Don't leave things that rot out in the open, of course.
Putting the garbage can next to the table while clearing it? Totally fine. Eating leftovers that have been refrigerated for a day? Totally fine.
I understand why you've developed hyper-vigilence living in that kind of environment. It makes sense. But I think you're probably overcompensating.
You might benefit from learning more about the human immune system, food safety, and other science-based topics. Did you know that urine, for example, is sterile? You can literally safely drink human urine (with some exceptions). Feces, on the other hand, is total opposite of sterile.
I'm sorry you have to live in such a gross environment. I hope you can find a way to convince your family to meet you in the middle.