Idek what to call it

I went 2 years of no alcohol just to test this theory on myself. Ever since I turned 21 (now 27) I’ve noticed I can drink an ungodly amount of hard liquor (I can drink an entire 5th of vodka, whiskey, Gin, you name it and still be functioning). But somehow, I drink a 6 pack of Coors light, a 4 pack of High Noon’s, or a 6 pack of Smirnoff and I can’t even remember what happened the night before. I just want someone clarity 😂 it’s not serious, but I’m mad confused as to why this is? I don’t take any prescription meds, I’m in good health and have a very strict diet. I’ve seen 3 doctors about this and they kind of just look star struck everytime I talk about it. Reddit, you are my 2nd option. Let me hear what you think.