Give it a little time. Sadly, when done properly, it can feel incredible. What he was trying to do was wonderful (in my opinion). But he assumed you were ready for it. And of course you were not.
So now is the time to figure out what you enjoy. While he did give you a bit of a bad experience... Maybe not completely abandon the idea of anal play. You might be amazed what it feels like when done gently and with some lubrication. Maybe try some little toys on yourself to experiment? Many of us got into it this way. You control the motion and learn what you like so you can tell the guy what works. Then when you hookup again... You have the experience.
That said, there are guys that completely detest anal. And that's fine too. But I would give it a couple chances practicing on your own and then decide. I mean, a LOT of us use plugs or dildos when masturbating anyway...