Why do I get tipsy to drunk so fast????

Im only on shot 3, about to take shot 4, but I feel tipsy.

I get Im a smaller woman, but ive been drinking consistently for 2 years. Lol. Like 2 or 3 times a week, I did have a 3 or 4 month break in between but still!

Im 5’1 115 lbs. And I feel drunk over 3 shots. Not thay im complaining. Jusy weirded out, cuz J used to drink half of a 750 ml bottle of straight liquor and feel almost nothing. And I think ive been drinkinf MORE since then, and not less