Do you know anyone that has never had chicken pox?

I've never had it. My brother claims he had it as an adult and it was awful. He reckons my dad passed it on to him from our niece and nephew as a carrier. Dad never recalled having it but he must have been 80 at this point and is no longer with us - basically I counted them both as slightly dodgy sources. I do know I never had it, but my best friend at nursery did get it, and I would have been exposed to it - it was very surprising to the nursery. I was also exposed to it via my teenage best friend who had a really tough time and had multiple shingles outbreaks. I didn't know or care that it was contagious to me, so I am fairly sure I would have touched it, and I would definitely help her adjust her clothing, etc, to cover it. When I did IVF I was also teaching small kids to swim and sometimes a parent would hand me a small, usually screaming child covered in pox, saying cheerily, "Oh you must have had it already and besides it's scabbed over!" (I mean has it? And once all the scabs float off in the water? Grim). Despite finding that very gross, I still didn't catch it. So, given the IVF and teaching thing, I went to the Dr who cheerily said oh I bet you had it when a baby (I was a first baby. My mum was very attentive). She did an antibody test- no antibodies. So I got vaccinated to try to prevent being pregnant, teaching and catching it then. I did not get pregnant, and I did not ever catch chicken pox. I have heard some people cannot hold immunity to chicken pox, and given I seem to have dodged it so often but didn't show up with antibodies I wondered if that was a thing for me, but I've never had the opportunity since to get a test.