I would be horrified and hope I was dreaming. That is one of the last things I want. Not only that, but I would be a seriously ugly piece of man. Already, I have issues with my body. I really cannot explain how much my self-hatred would increase and how genuinely stressful such an experience would be. The only me that can exist is female. End of story. Although I cannot say that I wouldn't try to experiment with the sensation of a male organ... in terrified curiosity. I am quite curious about what the other gender experiences.
Also, I will add that it wouldn't be so bad if it were the body of a male I find attractive. (Rare, but it happens) Still though, I'd rather be female.