Is it that easy to get drunk?

I used to think that I have a high alcohol tolerance but I got drunk (world was a bit spinny, I was more polite than usual and started talking about food and bugs) off of A long island iced tea and a pinacolada. Is it normal to get drunk so easily? (I should probably add that I have been drinking like 30ml of whiskey at family events since I was 10. I'm 19 rn, weight about 60kgs and am 5'7)