HELP: How to Tell Your Boyfriend You Don't Get Wet Enough??

I'm dating this new guy and everything is going really well. Except for a tiny thing with our sex. No matter how turned on I am, I just don't get wet enough for sex to be comfortable. I have to give him sloppy head ever 10 min. Even half my vagina is SO swollen every time after. I've never had a problem getting wet before, so I'm really confused. It's something not to be ignored, but I don't know how to tell my boyfriend. "I don't get wet enough" sounds like I'm not turned on by him, which I totally am!!! Like we just had sex and I was hornier than I've ever been with him and I was still bone dry. I'm super embarrassed about it. WHAT DO I DO?