I’ve never been hungover

I have been fucking demolished a few times in my life but I’ve never felt anything more than a light headache, and I’m not even sure that was because of the booze. I chugged a bottle of white wine last night, nothing wrong this morning. I drank a shitton of Jack a few months back and got astronomically wrecked, and felt nothing in the morning. I’m not complaining but why does this happen?