There is a very good book about the family life of Mary and Joseph, including the early years of Jesus that I can suggest to help answer your question.
You cannot compare Mary to an aboriginal tribal member though. She was from a well to do Jewish family who travelled to her cousin’s house to prepare for the birth of John. It is not clear how old she was, but certainly not a teenager.
Mary was taught by the angels for a long time, preparing her for raising Jesus as a child. There was much preparation to insure His safety from all the forces which sought to hinder Jesus’ mission. Joseph and Mary knew each other for a number of years before Jesus was born, because he too needed to know his role.