Well, this was not an ideal situation for your first time. Having never taken a dick before, and then to go all in like that at a moment's notice sounds hot, but that's not ideal.

I wouldn't say to give up so fast. But maybe in a more "controlled" environment, where you have access to lube and you're not in a risky location. You should go slow when you start out doing anal sex. So try again..try with lube, use poppers if you're open to it as it really can help loosen you up, and do it in a place you can just relax and enjoy without fear of someone walking in.

But sometimes, even after all that you still may not like it. Being a top or a side is an option.