anal virginity taken

So I have this fling with his guy, and today we were doing it bent over the chair and after he came he put it in my butt...it was the first time anything was in my butt and it hurt a lot I think..I wasn't even sure i was just in shock...he kept saying you like in the ass and then he said do you want me to stop and I said yes and he pulled out and he got dressed. Now I feel weird and I'm very upset because I never planned on having anal ever...but I don't think my feelings can be validated. I don't even know if I liked it because it was just a complete shock to my body. But he took my anal virginity....I don't even understand why guys even like anal?