Welcome, kimiann! I'm a first time mother as well, and I guess none of us know how to be mothers until there's a little baby in our arms and we have to deal with it. I'm sorry you have no family around, were you able to make some friends while in Hawaii? If you want, you can connect with other moms at la leche league, so you can be around mothers for some support.
About due dates and such, YES you are all right... but it's hard not to become anxious! Especially for first time moms. I wanted my baby to be born in november, because we are moving to our weekend home for the hollydays and for january, and I wanted the baby to be as old as possible, but meh, it is what it is.