The followers of an unheard-of-god from another land followed omens that led them to you. The omens indicate that you are to be the mate of an avatar (earthly incarnation) of their god. You disagree but are still harassed by the god's followers.
In adult life you gain a rival who seeks to undo your character, they will attempt to hinder your efforts until they get what they want. (work with your DM to determine details)