i can’t feel anything

I can’t feel anything when having sex, like literally nothing, it feels like when i am putting on a tampon. I dont know how to relax🥺. Yesterday, i felt a little bit more when we where on my couch and I was on top, we had sex like three times in the same day but the two last times I was completely dry, why is that? Like my vagina was wet, but my clit wasn’t, and I had to use my saliva as lub