Painful penetration..?

Everytime my boyfriend and I have sex, even if I’m really horny/wet and turned on beforehand, when he tries to put it in it feels like it’s ripping my vaginal entrance.

I can kind of compare it to forcing an earring through a piercing that’s been partially closed up. It almost like the skin around the outside closes up again after I have sex.

Does anyone else have this problem or know why it’s happening? It never used to be like this. It kind of makes me not look forward to sex anymore.