Huh?

About 2 hours ago I downed 2 and a bit mouthfuls of vodka (we ran out of soda and it was right there) burned my throat heaps and was def alcohol yet literally felt nothing, yet when I mixed shots of it before with other drinks I felt it, wtf??? It has not been watered down I completely forget about it till now and realised I never felt it

Is that just not a lot of alcohol? (I don’t drink very often at all)