Instantly falling asleep after drinking

Idk if anyone else experiences this but I always feel tired when i drink. I instantly fall asleep, meaning i get sleepy (not instantly blacking out just feeling sleepy) i started drinking at 12 so idk if that has anything to do with it. I drink ALOT of vodka and jack (2-3shots almost every day). Idk if anyone else has the same reaction and if this reaction means alcohol isnt for me.