I'm a 19 year old college student, I'm 5'5 and weigh 120 pounds. I've only started drinking last fall and it was at first really nice. I could drink copius amounts and I would still remember the night. However, last Christmas I experienced my first black out. I then began to brown out a bit and then blacked out two more times that Spring. It didn't matter how much I drank, I would completely black out. This summer I blacked out or browned almost every time I drank. Because of this, I haven't drank all semester. However, last night I went out and completely blacked out, after a glass of wine, a beer, and a shot.  

I'm going to give up drinking altogether, but I was just wondering if anyone knows why this would happen. Is it because I drink quickly? Don't eat enough? Please let me know.