Both my girlfriend and I have received the Pfizer vaccine and three boosters. Being exposed at work, she tested positive but asymptomatic. Me, tested negative and asymptomatic. This happened twice within a year's time. Natural immunity? Who knows. I am quite sure there are many secrets out there to be discovered. Even the definite origin of the virus has not been settled.
As for my girl and I, all we care is that we are both healthy and happy, she at 54 and me at 84.
Take care and hope you get better.