20 years old never had a pap

I'm about to turn 20 and I've never had a Pap smear or a pelvic exam or anything, I called my doctor to schedule one because I'm TTC and wanted to make sure I was healthy. They said they don't normally do that until you're 21, but that I can request it when I go in April for a routine checkup. I just thought that was weird because I've always heard you need to get one as soon as you're sexually active and I've technically been active since I was 15 and they're aware of this. Anyone else's health department/wherever you go to do it this way? Literally everyone I know has had one before lol.