Often times they aren't mentally ill, just confused as all hell.

I knew couple kids in my old high school that dabbled in that. This girl a few years younger than me was already sort of weird, and then she wanted to go by a different name, a boy's name if you will, but never made up her damn mind. One day 'it' was a girl the next a boy. She had a drunk for a mother and a father with health problems so that might have had something to do with it.

Point is you can't just 'feel' that you're something and then next day backtrack on it. It's pure attention seeking.