Can someone explain?

2 days ago I had 15 shots, not just shots they were Long Island iced teas so obviously it didn’t taste like 15 shots, I didn’t get drunk and yet I’m not a very heavy drinker (well maybe I am now I’ve been drinking maybe half the week) I drank today too, 10 shots and yet got wasted and passed out for a few hours. I’m confused as to why it didn’t happen 2 days ago? Was it cause of how slow I drank em? I drank 1 every 3 hours 2 days ago and I drank both of mine today in 3 hours. That’s the only difference. Lmk.