What's wrong with my vagina

So recently for about a week or 2 me and my boyfriend can't have sex as everytime it goes in it really stings and almost feels like there's no where for it to go almost like I've just lost my virginity but it really hurts like a have really stinging sensation when I go to stop its only when it goes fully in though if it's not too deep I can deal with it. My boyfriend is my first partner so I don't know how it can be any sti's or stds