As it says in the title, write an Ode To Your 18 Year Old Self. Not 18 yet? Write a love letter for a future-you. Currently 18? Write a reflection of your surroundings and experiences as they stand. Over 18? Well, you're probably smarter than you were at 18, so what has changed? It can be non-fiction, fiction, a poem, whatever your little heart desires. Go for it!