[Always *]

You could always address it to your teacher first in the assignment via writing. Just write in your assignment that "hi i am name, I am x years old and I am trans gendered." You could always tell a little story about how this acceptance of being trans has impacted you (like about how you've explored the trans community and such) and go from there.

Do you have to present it to your class too? Because you could always just start with certain people as it comes up (such as your friends, the teacher with this assignment), and then people will talk so people will just know after a while.