On the night of her school formal, Hannah Williams found herself all dressed up with nowhere to go.

After inviting friends to her home for ''pre-drinks'', the 16-year-old stood on her doorstep and watched her classmates file into the darkness to attend one of the highlights of the school year.

Instead of joining them, Hannah took off her heels and black dress and went to bed.

A few weeks earlier a teacher had told the year 11 student she couldn't attend the dance with her 15-year-old girlfriend, Savannah Supski. She was asked to bring a male instead. ''It made me very upset. I thought it was unfair so I didn't go,'' she said.