Can’t get wet

I’ve had this problem with my last partner and now my current one! Even though I want to have sex and I am in the mood no matter what I can’t get wet! It’s making me really nervous as I don’t want him thinking it’s him. Anyone know why this could be ? Also I have never had a guy make me cum, no matter how much fun I’ve had. Could it be something to do with me? Or have I just not found the right guy who can do it! Ahh help!!!