Too bad he didn't know what he was doing. You start slowly, with fingers and small toys, making sure she is enjoying it. You don't just shove your cock in. You didn't enjoy it because it wasn't done properly.
to Derdon1987 :I'm nut sure if sad is the correct thought. Remember it was my real first time I had a cock in my butt. Very strange feeling that takes some time to get used to.