Its a tough call as to how much of your story to share. Surely there will be some type of defined role you are suppose to fulfill while you are there. In that case you may not be able to share as much of your personal story as you might like to. If you do share, just be honest and be yourself and maybe you can help a student deal with their own issues. But on the other side of the coin remember that you don't have to share anything personal. The time may not be appropriate for you to share. Play it by ear....