Good morning troll.
Wearing a mask is not about stopping you from getting infected, it is about helping the germs coming out of your body from infecting others.
This is not going to be something that we don't need to do going forward, virus and bacteria are constantly evolving and we need to start doing things a lot cleaner.
Like I said before, this is the 2020 equivalent of whenever it was that we as a species learned that we needed plumbing because dumping shit outside of our homes is very unsafe to our health.