How much alcohol is too much for say people aged pepole 18-21 depending where you live drink a week

Im 18 and now that I’m legally able to buy my own Alcohol in my country but wondering how much is too much I’ll usually enjoy a couple drinks at the weekend and with forms and stuff and applications w stresses as a young Adult I could probably kill a half a bottle of wine a night I also like ciders and could drink 3-4 pints I’m just wondering how much you drank at that age also I don’t drink on school days