Can’t Get wet !!!!

My boyfriend and I just tried to have sex!!! No it’s not our first time but out of 100% of our sex 70% we’d have to spit use lube or something because I cannot relax and get wet!!! The other 30% I would but I’m tired of it! I find my mind racing and thinking of just stupid random things! And I know it hurts him! He thinks I’m not attracted to him!! Although I really am! I just don’t know what to do anymore!! I’m young! This shouldn’t be happening!!! Idk what to do or think anymore! It’s embarrassing!! I usually self lubricate during sex but getting him inside is the issue!!! It’s becoming awkward!! I need advice!!!!