Why would you think you won’t get sick?
The majority of the hospitalizations in Israel are fully vaccinated people.
The majority of hospitalizations in America, where I live, are unvaccinated people.
I am not in the least bit worried about getting Covid. I'm vaccinated. I take care of myself. I'm not overweight. I'm active. I have no comorbidities.
The CDC isn't worried about me getting Covid. They're worried about me giving it to someone unvaccinated. As far as I see it, that's their problem. They had their chance to get vaccinated. Still do. Their health is not my responsibility and I shouldn't have to wear a mask to mitigate my risk to these people.