How did I GET TIPSY FROM ONLY ONE BOTTLE OF CORONA 355ml 4.5 ABV (225lbs 6,1)

Wtf bro i never ever get tipsy, i have a rule no getting drunk, no more than a cup in one sitting,no hard liquor, only wine and beer (unless major life event) and a minimum of 1 month separation, started drinking at 21 (6 months ago). Wtf today i didn’t drink water properly just 500ml, the ambience was mcdonalds chicken nuggets, chips and blues, my friend was smoking. Any ideas because i am afraid that i might get addicted ( i am still tipsy while writing this) and the problem it was peaceful my ocd is gone, depression almost gone and loving the nature.