Why do I have a natural high tolerance?

Last year I went on a snow trip with some friends. I only drink during special events such as family parties or special events. I’m not an avid drinker, nor do I seek it out on my free time. I’m around 5’7, weight is roughly 141 lb (64 KG), and male.

Here is the list of drinks I had since I wanted to keep track:

7:03 Jack Daniel’s Old No.7 Sour Mash Whiskey 7:11 Jack Daniel’s Old No.7 Sour Mash Whiskey 7:24 Jack Daniel’s Old No.7 Sour Mash Whiskey 8:09 Crown Royal Fine de Lunes Blended Canadian Whiskey 8:59 Crown Royal Fine de Lunes Blended Canadian Whiskey 9:46 Crown Royal Fine de Lunes Blended Canadian Whiskey

This is one of the first times I drank this much, so I didn’t want to overdo it. I guess another thing to mention was that I ate dinner before. The only thing I really felt during the time was being warm. I didn’t feel dizzy or feel like throwing up. I wasn’t out of it either and I had normally functioning conversations with my friends (some were already out of it, two puked). We all drank the same stuff too as well. The time stamps you see is when they drank too as well, since we all had shots at the same time.

I’m 99.1% East Asian and some Japanese and European mixed in there. Hope to hear some explanations!