Why don't I have a hangover?

I'm 18 and I've drank only 3 times in my life. I got drunk for the first time 2 nights ago, very drunk. I threw up on myself, my friend, my bedroom floor and closet, in the sink, and everywhere. I can't remember a lot of what happened. I have bruises and cuts all up my arms, legs and feet. Not to mention a big bump on my head from hitting it on the counter. I did drink water only to throw up after each glass. My ribs are in immense pain even now, I expected it to be gone by today. It's not my liver or stomach, but my ribs hurt when I breathe in. After all this I still have no hangover. I know what a hangover feels like because I had one before when I wasn't even drunk. I have very little experience with alcohol so I can't be accustomed to it or whatever. So why don't I have a hangover?
Why don't I have a hangover?
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