You will write an email to yourself, to be delivered in the future.
In this email you can write about what is important in your life right now, things you want to do in the future and whatever you hope to achieve when you receive your email in the future.
Decide when you want to receive your email. At the end of the school year? In five years? When you finish high school? It's up to you, but make sure it's at least six months from now!
When you read your email again you can see if and how much you and the things around you have changed.