Maybe it's a herd immunity thing or something and others are keeping me safe, but I'm 41 and Ive never taken an antibiotic and neither has anyone else in my family to my knowledge. I still can't figure out if it's the chicken or the egg.. have I never been sick because I don't take part in the medical system, or do I not take part because I've never been sick.. Then again last time my cuticle got infected I sterilized a knife and drained it myself. My friend said he had something similar and they gave him an antibiotic yet DIDNT drain it until it got worse and then they just did what I did. But at least they got to sell some antibiotics.
You have absolutely been sick, but your immune system fought it off. You have a permanent low level of opportunistic infections because everyone does.
You may not have had symptoms, but that's a very different thing.
And I assume you've been vaccinated against all the usuals.
Antibiotics should IMO be reserved for life threatening situations, or likely upcoming life threatening situations. In the 80s as a toddler I was given antibiotics for measles (they can’t possibly work on viruses), and had half a year of diarrhea afterwards.