well hell. Due to the opinion of many here if u even look at a bottle of wine, your going to hell.
Underage drinking of course isnt okay because we also are supposed to go by the law of our Land too (unless it goes against God). In germany drinking is allowed. Im not a person that gets drunk but most will say if you drink a glas of wine you sin, I disagree. The bible tells us that drunkenness is a sin due to the fact that it makes you loose control over yourself and your supposed to be sober and vigilant.
I will not damn anyone, who met the legal age of their country, when you drink a glass of wine or beer. Stay away from hard alcohol thou as there is stuff written against hard alcohol (which makes sense)