A Stupid Prophet Decided My Fate, so Now I Dress Like a Girl!

To save a kingdom in an era of chaos, the king called for a prophet whose prophecy would quench the anger of the people and possibly make the land prosper once again; "If thou wishes for thy kingdom to prosper, only with the birth of a girl it will." However, a healthy baby boy was born and now the land is doomed to wither away unless the boy turns into a girl?!