Question about getting/being hung over

Just hit 20, never really drank to get drunk until I turned 18, had an occasional beer here or there when I was younger at the quinces and family gatherings, however when I started to drink harder liquor I noticed that I wouldn’t get a hang over the next morning. Not matter if it was three shots of half a bottle.

Lot of guys in my family have alcoholism and drink constantly, could they be something to do with it ?

Anyone else just never get hungover not matter how much they drink ?