Not feeling the effects of alcohol

I never really partake in the consumption of alcohol, probably once every 2 months if not less. When i do i usually drink sunset strong rum which is 84.5% abv and usually feel slight effects in about 3 shots. I also get hangovers from little to moderate amounts of alcohol one of the reasons i avoid drinking. This is where things get interesting, it was my friend’s birthday yesterday so we decided to drink, sunset 84.5% abv, campari 25% abv and diamond rum 40% abv. I drank about 4 shots of sunset, probably 3-6 shots of campari and I didn’t even count how many shots of diamond rum, I felt absolutely no effects whatsoever, not even a slight tingle.I went to sleep and slept normally probably for 6 hours and woke up with not even a slight headache. What could be wrong? There was a pattern that made sense, if i drank a little amount of alcohol I’d get tipsy and get a headache in the morning. Now I don’t know what the hell happened, my friends definitely felt the effects so it can’t be the alcohol.