I definitely can commiserate. Old Man was "Lifer"- - first theatre was "European Theatre" (yeah, THAT one) but he was at one of the Kent air bases and his last "in country" was Nam, where he lost his barracks in a mortar attack on Tet.
From third through seventh grade.... I was in 8 different schools !! (... and any pre-school would have been overseas (another one), but I can't remember it). Most moves were ~1000 to over 2000 miles, so no keeping track of anybody. Generally, "locals" tended not to spend time with the "military brats" since we'd be sent off fairly soon, so they figured "why bother". I looked on G@@g£€ maps and not one location from my past from before the eighties still exists!! all either brownfielded (could still see outlines of "what was") or demolished and replaced. (and we even avoided a different overseas deployment, which would have added another). {as "brats", for the one location we even had "dog tags" issued... still have them}
As for the question "where are you from?"... I say that it could take awhile to explain
I've not relocated nearly as much since undergrad/grad school but did a few times; most can't come close to understanding our much different experience.