why do i sober up so fast?

i dont understand it and it kinda pisses me off lol. im 5’8.5, ~140lbs, and my entire life ive had a slow metabolism. im not sure if its faster now, as i lost over 20 lbs in the last year or two, but i didnt drink then so i dont have a comparison. im a super lightweight, almost stumbling after just like a shot. but it feels like it takes 30-45 minutes for me to be almost completely sober again. its also not that i eat a lot, i was on basically an empty stomach this friday and i drank a good bit but had to keep drinking to keep myself inebriated for just 2 hours. it also wouldnt make sense for me to have a high tolerance, as before coming to college(im a first year) i would essentially never drink. it also wouldn’t make sense for my liver to be uniquely strong, as i have a family history of alcoholism, my grandpa died a few months ago of liver cancer, and in the past i frequently took a medication that filters through the liver that absolutely should have weakened it. so what the hell is up with this weird ass body of mine?