Wearing a mask is more to prevent spreading a virus you have, than to prevent you from getting a virus. In other words, the main benefit of masks is to prevent people with COVID or the flu from sneezing and infecting others.
If you're healthy, wearing a mask is not going to provide a ton of protection from infectious people near you not wearing masks. A little bit of protection, but not a lot.
So unless you can convince everyone else in your meeting to wear a mask as well, it's not going to make a major difference, sadly.
Thus, you can't simply choose to keep wearing masks and get significant reductions in getting sick. Everyone would have to keep wearing masks, which is very unlikely.
Similarly, before the pandemic it was totally normal to go to parties with a cold or respiratory illness. I sincerely hope people keep the behavioral shift of not going to any events when sick, but humans are selfish and I bet they will largely return to their selfish ways
It doesn't matter how much you wash your hands, or cook food at home. Plenty of germs are airborne and linger. Unless you stay at home all day long, you're going to get sick.
Now some people have much more effective immune systems than others, and a lot of that is just genetics. Sounds like you're exceptionally lucky here.