Sex problems😥

Everytime I have sex with this certain person. It hurts like fucking hell. Like it stings. I don’t have this problem with anyone else. But it stings when it goes in and when it’s happening. When I suck it, it does taste a lil funny. We keep having to stop because I can’t take it. It’s not good sex pain it’s pain pain. What do I do??? Why is this happening???