Have you been vaccinated? Then you might experience some weak temporary immunity to the virus. Have you recovered from a covid infection? Then there is substantial evidence that you have significant, long-lasting immunity from covid.Pretty sure =/= know.
Utterly irrelevant. You have no immunity to the coronavirus, and it is estimated to be as contagious as chicken pox.
Whatever you have to tell yourself. We know that a lot of other people who have died of covid also had your bravado. Phil Valentine, etc.