I don’t get drunk even though I hardly ever drink

Ima just start right off the bat, my partner and I wanted to see what I would be like when I‘m drunk or tipsy, because I never drank enough to even get there, usually I just drank a maximum of two glasses of champagne or one cocktail.

So we sat down together, on a relatively empty stomach, and I just chugged down, in multiple takes, about 3/4 of a bottle of gin (I assume about 500 to 600ml / 16oz / 1 pint; whatever measurement system u prefer but it was that amount).

The chugs were pretty big and quick, my partner was slowly getting drunk himself by sipping some gin but I had zero effect, I felt the same as before, no difference at all.

So now I am wondering, how is it possible that I didnt get drunk or even tipsy? Mind you, I am a 5‘3 short (about 160cm), female and rather skinny woman lol.

Is there any explanation to this?

TL;DR: I cant get drunk even when I drink enough to get others drunk, even though I hardly ever drink in general and was never drunk or even tipsy before.