It is not an affectation, and NO, everyone's ears aren't the same. I have the same thing...it is a genetic sensitivity to loud or sharp, sudden noises, even .22 LR. It is not something you can "get used to", as much as I have wished it for the last 75 years. I suppose it is different for individuals...some not so sensitive, etc.
Muffs (the electronic ones that let you hear normal conversation are good) and/or ear plugs... wear them prior to entering the range. Not a perfect solution, but it helps.
It is like that other thing that "manly"men make sport of...recoil sensitivity! Years ago, Jim Carmichael, who was a writer for one of the outdoor magazines, and a premier big-bore competitor, wrote that suddenly, in the middle of a match, he could no longer shoot his 30-06.
His shooting just fell apart, and continued that way. IIRC, he said he was diagnosed with extreme recoil sensitivity, which was cumulative through his competition life. He designed a 6.5mm cartridge, which had less recoil than the '06, and went back to competing.
Now, gunwriters seem to generally agree that we shoot best what kicks us least. I suspect that is the reason for the relatively heavy, mild recoil, minor caliber rifle that is issued to our armed forces, instead of the Garand or M-14, and we are given "the story" of more ammo load-out.
Not much to do about either condition, except use noise or recoil reducing products, and enjoy the sport as much as you are able, although the medical profession may have more information about the hearing condition now.
Good luck!