Does it taste tart or truly like vinegar?
Sounds crazy, but put a drop of vinegar on your tongue to compare the taste.
It is too young to already be vinegar.
I'll bet it is just very tart. I think the word amarone translated means some like "a little bitter" in English.
A young wine is always going to be tart anyway,but an Amarone is always going to be "a little bitter".
If it truly is vinegar, which takes months and months to form, it will never change back.
The wine should be fine in 18 to 24 months.