Why do some people black out yet no matter how much I drink I have never blacked out?

I have never once in my 15 years of drinking blacked out. I have been drunker than a skunk more times that I can count. I can notoriously polish off entire bottles of brandy in 2-3 hours. I have gotten the spins, I have made mistakes while drunk, and I have puked buckets but never once did I “black out” and not remembered the ass I made of myself. Is there some kind of gene that I either have or am missing? Im an American of Irish and German descent, notorious European drinking countries and my family is full of functional alcoholics if any of that matters.