Swyer syndrome (XY gonadal dysgenesis, XY female)
Swyer syndrome means you are a chromosomal male (46, XY), but - aside from ovaries - the rest of you is 100% woman. This means you look and feel just like a woman, but your chromosomes say you are a man.
Clitoromegaly
Large clitorises can develop for several reasons, with the most common being an excess of androgens for some reason when a foetus was developing.