Sex/Masturbation problem

When I really want to have sex I get wet but when I'm about to do it or mastubate I'm dry like I feel I lost the interest🙁I like sex (I'm not a hoe I have a boyfriend) and so does my boyfriend. Like I don't know if there's something wrong me or is it because I still get nervous. FYI: My first time was with my boyfriend and it's a long distance relationship🤗💕 Please me understand!!! I don't talk to anyone about my sex life