Not getting drunk

Hello, I am 19 years old and a male. I bought 2 bottles of captain morgan spiced gold today down at the LC and I’ve downed two thirds from one of them during the course of about 4 hours. Also, I had not eaten anything by the time I started which was around 8PM).

The thing is, I only feel tipsy. I don’t usually drink, and I have not been drinking for about 3 weeks. Does anyone have a clue why this could be? I mean geez I payed 50 euro and I expect to get drunk on a marvelous friday night such as this one.