Am I a lightweight drinker?

Alright, so I am only 4' 10" and weigh like 85 pounds. I am 16 years old (save the lectures please) and I got drunk for the first time last night. I drank about 5? beers in a 30 minute period and got SMASHED. I was so dizzy, slurring my words, and quite frankly I do not remember much of last night. Gonna need my friends to tell me what happened cuz I blacked out most the night. Am I a lightweight? I am very small so I figured I would get drunk easily but I only had like 5 beers...and that was definitely over my limit. I do remember being pretty drunk and my friends telling each other to not let me drink anymore...but after that the alcohol kicked in even more and I don't remember anything after that. My brother was there and he is saying I was faking cuz I didn't drink enough but jesus!! I was definitely not faking, I don't even remember most of what happened