Obviously, its the second one. Girls are just forced to grow up faster because of society's treatment towards women.
A friend of mine once wondered a very thought-provoking thing. There are so many male drunkards on street, but why almost no females? All the female junkies, almost all of them are at home, inside the four walls. Why? Because of the insecurity instilled inside women by the society, the violence, or, the constant threat of violence. Even drunk women know better than roaming the streets at night.