Don't worry, you're not alone. Everyday I feel like a burden to somebody around me, even people I don't know or ever met in person. And as for not writing the email or talking to the teacher - that's very normal when you've got depression. It once took me 2 years before I could send a certain someone in my life at the time a message about something I really wanted to tell them. I would try to rationalize and predict all the different outcomes for hours everyday, trying to think up reasons why I shouldn't do it, trying to foresee what the person's answer would be and then using that to discourage myself. But, the truth is, there is absolutely no way of accurately knowing how that person will respond, and it's often a lot less dramatic than how you envisioned it. When you constantly think about the response, "how will they take it?" you automatically assume the worst case scenario, at least, that's how I always see things. The truth is though, you really can't say until you've tried. Almost all of the time your assumptions about the outcome never materialize, and all that worry is for nothing.