4 cosmos should get me drunk??

ok like i’m 25f, 5’6 about 125lb and i had 4 (good!!) cosmos tonight and didn’t get even a little drunk. why am i such a heavyweight. i’m also on lexapro??? i take it before bed if that matters???? am i ok?? i really don’t think i have a drinking problem i just smoke a lot of weed. this is getting really expensive and annoying. help