Vagina fluids

So idk if this normal but everytime my boyfriend and I have sex and I get wet, that wetness dries into this thin sheen. And if he tries to rub me or if i grind on him, it creates these chunky rolled up things. I’m so confused. I’ve never really had sex before him and don’t masturbate to the point that i get that wet either. Someone please tell me why this happens or if this is normal?? 😶😩