I'm a 21 year old with limited sexual experience mostly due to a very religious upbringing and not being able to let loose till college.

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I've only really had 3 sexual partners 2 of which have been long term gf, so safe to say i'm not very versed in hook up culture and the such.

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Okay so I'm on this tinder date with this girl (our first and after tonight last date) who happens to be in the same program as me and we've hit it off, she made multiple references to fucking during dinner and on the ride home so I was quite aroused and excited by the time we hit my place. We're making out while heading up to my room and she whispers in my ear "I want you to fuck my ass"

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Now i'm not sure about most guys (which is why i'm on here asking) but to me fuck my ass sounds like she wants butt stuff, I wasn't sure at that point so when we get to my room, starting tearing off each others clothes and making out in my head I still wasn't going to attempt butt stuff since I guess the vulva is located very near the ass when in doggy so she could be using short hand. When she gets into position however she moans "fuck my ass, yes fuck my ass" and that was enough for drunk horny me to be convinced so I went for the poop chute. Immediately she yelped and says stop so i stop immediately since I'm not a rapist and jump of the bed and she's screaming at me over how retarded i have to be to fuck the wrong hole. I told her I thought she was telling me to fuck her asshole when she was saying fuck my ass and she called me autistic for taking it literally. I get a little testy and say it's not that common to say "fuck my ass" as something meaning regular sex and why she couldn't just say fuck my pussy instead and that made her really mad so she got dressed while yelling at me claiming I did it on purpose and left. 

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She's in the same program as me so I'm kinda worried she's going to start going around telling other girls and maybe my friends that I tried to fuck the wrong hole on purpose but honestly I just thought she meant asshole when she said "fuck my ass". Am I the asshole here? 