Ah, you fell for the classic blunder! Accidentally feeding Robin your pronouns... Happens all the time!
Fortunately, there is a quick fix that doesn't involve farming for horse coins early game. After saving your profile (which only needs a nickname to continue), exit the character creator to the main menu (the bookshelf). From there, click the gear icon at the top right (which goes to the settings/preferences menu) and scroll to the bottom. Select "Reset Profile" and Robin will return your pronouns, albeit slightly damp.