No guarantees in life. We all must do our own risk assessment multiple times a day.
There are plenty of people who would think it unreasonable for a healthy young person to be afraid of Covid.
I personally think it's perfectly reasonable for someone like me. Young, healthy, fit, to not be afraid of Covid. The odds of me having a bad outcome are astronomically low. So I can't concern myself with them. If I did, I would have to start concerning myself with a host of other "potential" killers out there, and for me, that's no way to live.
Now, before you ask, I am vaccinated. I got vaccinated because the risk of a bad outcome from the vaccine is ALSO astronomically low, and I can't concern myself with that either.