Why don’t I get hangovers?

I’d say I’m a pretty heavy drinker, not in the sense that I drink daily, I drink about once a week sometimes more, but when I do drink I drink a lot. Usually go for a couple four lokos, I’ll drink like 3 of them in an hour or so but sometimes I get a litre of vodka when I have the money and I’ll down the whole thing in like 30 minutes and sometimes black out from it. But never once have I experienced a hangover. Am I just genetically lucky? Is it something that will start happening as I get older? I’ve always been curious about this because I always hear people complain about hangovers but I’ve never experienced one