help!!

Am 20,just turned 20 9days ago..lost my virginity on the 14th of September 2016.. And since then I have had a lot of sex with my SO. But I noticed I get sore during sex and want to stop 80% of the time.. Don't know if it's cause bae lasts too long for a beginner(me)..how do I get this pain and soreness to stop. Not like am dry,but just too fragile down there.what can I do to stop the soreness and pain during and after sex