Hurting during sex

Hi ladies ! This is kind of an embarrassing topic for me but here it goes ........ I'm next to sex and have done a couple times but recently when he is penetrating me it hurts. It feels like
He is hitting a something and it doesn't feel good I also feel a lot of pressure. I don't think it's from being too rough because he'll slow down and i will still feel a lot of uncomfortable pressure ! Could it be from having too much air inside ??? I'm clueless ! Please help !!