You may be right. But for the greater good it's good to wear one. It does limit the spread. No, that does NOT mean that wearing a mask makes you immune but it certainlly does help. What's the harm? It doesn't limit oxygen levels. If it makes it hard to breathe, that's because the brain goes into fight or flight sometimes with a mask. In fof mode, you breathe out of your mouth way more and the fabric makes that uncomfortable. When that happens, take breathes out of your nose and it will go away. It's not all about politics.
China has opened up about cases, yes we can be sure it's gone down, maybe not to that extent. I'd say it's between 7-100. They have listened to health experts and know what to do. Do you even wear a mask?