How much can a 16 year old alcohol virgin drink without getting completely hammered?

I’m going to a party on Thursday and I know for a fact that there is going to be alcohol. I’ve never drank before and I would like to know how much I can drink without getting completely smashed. I’m about 5’9 and 120 pounds, if that helps. I also know that one shot is equal to one beer. My main question is, how much alcohol is required to get a hangover, seiny as I would like to avoid that. FYI: I live in a certain European country where the furlongs he is significantly lower then the USA so this is all legal to my knowledge (No, I will not be driving)