Most unrealistic 16 year old ever
Aside from the fact the actress looks nothing like a 16 year old, she also behaves more like a 25 year old. Sure teenage girls are horny, but not to the extent where they literally try to have sex with every single male they meet. Let alone be willing to have sex for any excuse e.g. to get a job in a random shop. Basing what an average 16 year old girl is like on myself and people I grew up with, this portrayal is incredibly unrealistic. I'm not saying this is correct, but girls tend to follow social norms which say sleeping around if you're female makes you a slut. Also most girls wouldn't feel comfortable having sex with complete strangers unless they're drunk. It is a societal fact that guys are more free about sex than girls, including talking about it and doing it. She behaves more like a 16 year old boy than a 16 year old.
Also, the character seemed to have no emotions whatsoever. She displayed absolutely not evidence of being worried, nervous or even excited by flirting and getting it on with all these men. Even when she was rejected by Joe, she wasn't even upset or embarrassed. Wtf? Most girls her age have insecurities, and wouldn't feel that comfortable in every single situation. They wouldn't just be able to walk into a bar on their own and comfortably hit on every guy in there. I don't know anyone who would feel that comfortable being intimate with complete strangers. Also, unlike a regular 16 year old girl, she doesn't wear any make-up or spend time on her appearance. Again, completely weird! She MUST have some sort of personality disorder for her to be this unaffected by all social situations.
I was expecting it to be revealed that she was molested as a child or something, the way she behaved was completely not normal for a girl her age. Not saying it isn't right just because it isn't normal (well, hope she was using protection and didn't get HIV), but if the filmmakers were trying to show a coming of age story that people can relate to, they didn't.