Then you are feeling secure without any justification. Don’t you worry that your seatmate is carrying bubonic plague? Or a novel variant of COVID-19 for which the vaccine is useless? Or that they’re one of the 10%+ for whom the vaccine didn’t even work? Or that the mechanic didn’t replace the widget in the engine that will save you from a fiery death on the side of a mountain? Or that, because the planet is obsessed with COVID-19 and is ignoring absolutely every other threat to humanity, there are three terrorists flying the plane?
There’s no such thing as absolute safety. Your lifetime odds of “death by doctor” (drug overdose, misprescribing, failed surgery, etc) is about 1 in 60. Your lifetime odds of death by car is about 1 in 100. For a 50-year-old man, lifetime odds of dying of heart disease is 1 in 2. Your lifetime odds of death by COVID-19 is virtually zero if 50%+ of the global population have already had the disease and/or are vaccinated.
If you want to put your faith in magic potions that’s up to you, but it’s not reasonable to expect everyone else’s life to revolve around your personal phobias.