Does this letter sound okay to give to a high school teacher?

"During the first couple weeks of school, I wanted to bring something to your attention that you may or may not have realised. I have a rather weak immune system. I care about your classes and I'll do my best to make it here every day. In order to do this, it would mean a lot to me if you could try to break the habit of licking your finger when handling the papers you pass out to the class, even if you aren't sick. Thank you!"

Does this sound weird? I have a habit of overthinking everything...