The song's 17-year-old protagonist suffers from substance abuse. According to the Carmen Songfacts, Del Rey has admitted that she had a problem with alcohol when she was a teenager, but hasn't drank for a number of years, although she will drink casually occasionally.
Darling, darling, doesn't have a problem
Lying to herself 'cause her liquor's top shelf
It's alarming honestly how charming she can be
Fooling everyone, telling how she's having fun