Pain while having sex

So whenever my boyfriend and I have sex, i have this pain right on the inside of my vagina. it feels like a pinching pain during intercourse and it is honestly rlly annoying. It is hard to enjoy sex with this pain. i am on birth control, and i think that it may be causing me to be less wet? im not sure but i need someone else’s opinion. I know it wouldnt be any type of infection or std because my boyfriend and i have been together for 6 years and have only had sex with each other. someone please tell me what they think.