Can’t tell which hole during sex?

I know it sounds crazy, but lately I can’t tell which hole my BF is putting his penis inside of. Usually we have anal sex (almost always) but it’s been feeling different??? If that makes sense, like I just can’t tell which one it is lol. We don’t have sex often bc of our work schedules, so maybe that’s why i cant tell???? I know I should be able to but seriously I can’t during sex.

I asked him if we did it our usual way and he was like yeah. But it just feels different and my vag hurts. LOL. I feel like he’s lying....