Why am I so lightweight?

For context, I am an asian (if that matters) 6’0 180lb male early 20s. I usually get tipsy-drunk off of 3-4 and drunk off of 2 beers, buzzed off of 1. My family is full of women and they are all don’t get as drunk as me even if we all drink around the same amount. Is this due to genetics? I’m half asian and I get the asian flush and i’ve heard that we process alcohol differently. Why am I so lightweight?