Had to stop having sex

Nicole • I'm 17
So I had to stop having sex with my bf because I can't get "wet" that's the only thing I can think of. I tell him no and he gets mad.... And I tell him I'm sorry and then when we try to go Again still don't happen.. I'm not Horny anymore and it hurts like a bitch now when it goes it 
What is wrong.. And Ik I'm young but we both lost our virginitys to each other.