Why am I so dry down there???

Hello, I’m 21, and I’ve been sexually active for years, but I wanted to know why I am so dry down there, like when I have sex I can never get wet or I just only get wet after getting ate out and this been going for about 3 months now. I never had an issue before, but I feel like I’m dried out and I do drink lots of water and I’ve been losing weight. I havent had a dry spell like this ever and this is the first time I’ve ever had it. When I was younger and even recently so, I was fine, i was producing lubrication and I used to be wet and stay wet during sex, but now it’s nothing, my underwear doesnt need pantyliners or anything because I’m not even getting vaginal discharge anytime during my cycles. I don’t like it. It’s like I’m really horny and want it and i feel that i want it but I just cant get wet. Im really attracted to my boyfriend, I’ve been using lube but I do not want to depend on lube. I want my natural lubrication back. What should I do??