Am I lightweight?

first year undergrad at uni here in the uk, so first time really drinking

obviously I’d had pints with dinner and the occasional rum and coke or whiskey, but never proper drank until now

drank just 2 rum and cokes last night, about 1:3 37.5%, and it hit me pretty bad

was already feeling a little buzz after the first glass, and was quite dizzy and thoughtless after the second

waking up today got an awful headache and feeling sick

am I just very lightweight?

I’d have expected the opposite, given none of my family are and I’m quite a heavy man

only time I’d ever had even a slight buzz before was after 4 pints within an hour