Why do I sober extremely quickly? Anyone else?

I just went to a tailgate before a football game with my friends, had about 5 1/2 beers in about 20-30~ minutes. Got pretty tipsy quickly and I was somewhat dizzy by the last one.

Between walking back from the tailgate and waiting for them to open the gates to the game (about an hour-2 hours after drinking) I was entirely MENTALLY sobered (I’m aware blood alcohol content can be entirely different but I genuinely feel both physically and mentally normal)

All of my friends drank slightly less than me and were buzzed for the most of the time, and I also hadn’t eaten prior and only drank a redbull before coming. I assumed this is why I felt the effects so quickly? So then why did I feel fine so fast?

Also, I definitely don’t think I’m a heavyweight (obviously), and my metabolism isn’t high at all, sooo

Sorry if this is a dumb question.