My vagina hurt 😞

I never experienced this before but recently my boyfriend and I were having sexual intercorse after awhile it was amazing. Till two day ago when he put himself in me. It was painful! We were both horny but every time we have sex my inside hurt. It felt like a burn or something. Can anyone tell me what this is and how to cure it ? I really want to have sex w him again (without pain this time ) 😂

Btw we don’t have any hiv/aids/ std etc... also We didn’t use any protection so it’s wasn’t a allergic reaction. Just skin to skin.