Me too, except for Xsas.
When you pay your own bills , in other words, take on the responsibilities of an adult, then you can say you're an adult. That means rent, utilities, food, insurance, loan payments, and credit card bills, among other things. Until then, you're only an adult from the point of view of the legal system.
Want to be an adult quickly? Join the military. Betcha that'd do it. No, I didn't do it either.