Why aren’t I getting wet

Does anyone else have a problem getting wet ??? Even when I’m really horny and/or touching myself I don’t get wet. Even when I’m so into my boyfriend and I’m feeling so good I suddenly just get really dry during sex. It’s starting to become a problem bc my boyfriend is uncircumcised and I tend to rip his skin every now and then. I know there’s lube. But I just wanna know is it normal??? I’ve read somewhere once that it was. I’m only 19 shouldn’t I always be wet