Sex question please answer

I’m 21, for almost half a year I have been having uncomfortable sex.. I’m engaged and when my fiancé and I got back together over a year ago we have had sex very very frequently and it was amazing and I love sex. But now it’s uncomfortable and feels like pressure and sometimes itll hurt. I have been to the obgyn for it but they say they can’t find anything. I haven’t been to the obgyn SPECIFICALLY for it but when I go for regular check ups like std check ups or whatever and they said I have no infections and no stds and no cysts or anything and I brought up during sex it’s uncomfortable they tell me it could just be around the time of the month it happens. Well it’s not.. it’s honestly every single time we have sex now. Like it’s anytime, not on my period, on my period (not like we do) , on ovulation week, like just ANYTIME ANYDAY. It’s FRUSTRATING ANF KILLING MY SEX DRIVE. My fiancé has a high sex drive and so did I and now it’s killing it. I never wanna have sex anymore with him, ONLY cause it’s uncomfortable and it’s making me sad and hurting. I love love sex and I love love him. I’m not sure what to do. Is there any lubes to maybe help? Or anything else that could help? I’ve been on psych meds since I was 14 and so I’m not sure if maybe this might be the cause of it but it’s been a while so idk. ANYTHING to do to help a girl out PLEASE 😭😭 ps: it was never like this before it just started like a few months ago and the docs say I’m good medical wise so idk why, maybe I’m not wet enough even though I seem lubricated enough , maybe I just need more lube or something??