Drinking at 15 underaged: Okay or Not?

So, today I got myself drunk at school with my dad’s whiskey, but I didn’t do it to ‘party’ with friends or try to ‘look cool’- I just need to get my dad’s whiskey bottle empty so he won’t drink it. But I’m not a fan of wasting stuff so I decided to drink it while I was at school, to a point where I couldn’t walk or keep my head straight, and my vision was getting blurry and spinny. Even my friends seemed to be amused by my drunk self. That effect is not there anymore, and this isn’t the first time I got myself drunk. Last time was at on the 25th or 26th May – which is like 2 months ago – and before that I drank my first vodka shot with my dad on Christmas. However, now I’m sitting here terrified that I might get addicted just like my dad, and I obviously don’t want that. And my question still stands: Is it okay for a 15yo guy like me to drink once like that, or is it gonna fvk up my entire brain chemistry or sum??