You were born into a typical rich family with a mom who spoiled you to death but however she did make sure you didn't become bratty which was good for her to do.
But however, when you turned 18 you remembered all of it, about your past world and about the god, you didn't know what she wanted you to do in this new world or why she even chose you to begin with, but however you know there has to be a reason, and you are the only hope for your world.
Today you woke up to your mother waiting on your bed. "Good morning my child. I have some very important details to be telling you." She got up from the bed as she sat right next to you. "As you know mommy has a lot of money and I take care of you very well." She lets out a smile as she stands and puts her hand chest. "Well I'm here to say we are going back to our castle, as you are the new heir to the throne."