As was previously stated it appears there is only one logical option. I'm sorry you had to witness so many common trolls, but hopefully I can clear things up for you, so you can get a quick, acceptable, resulotion.
The only real step you can take at this point is to get your phonebook ready, find a nearby place if possible or you may have to outsource the job. Either way find the nearest Surgeon willing to do a sex change operation. You can always opt for cheaper Medical Professionals, but do you really want to risk a botched job? Anyway I wish you success in your endeavor.
I have no idea, if it is not in the settings, then it is probably not possible. So you should try and contact admin or just cancel and create a new account. But it is probably not possible because the ability to change your account from gender to gender on your own has so many flaws. People would troll like crazy and it would mess up results.