Jamie Windust is campaigning for non-binary people to be recognised on passports and other official documents.
The Londoner does not identify as a man or a woman.
Jamie has started an online petition to change the way the UK categorises gender – and so far, it has been signed more than 16,000 times.
The charity Stonewall estimates there are about 600,000 people in Britain who identify as trans, including non-binary people.
The government says it has no plans to change policy.