This question is for christians but specifically catholics?

I am very, very confused about the virgin Mary. I grew up in Mexico as a devout Catholic but later due to money constraints we had to move to the U.S. and my mother changed our faith. One of the many unanswered questions I had about Catholicism is who is the virgin Mary, the virgin Guadalupe patron saint of Mexico, virgin Mary Magdalene, virgin Fatima. I've heard from all of them to be the mother of God. Is this true, are these the same virgin? I'm so confused about this topic and would like to know more.