Good! That seems very a very hard time!
I'm so sorry that you have been going through all of this. It seems that your mother clearly don't understand depression. I would say to you to talk to her oppenly about how do you really feel, but it looks like it would make things worse. Being in that envirement is certainly not a good thing.

Have you got any help? Can you tell your director that you can't trust your mum, that she is this hard on you, for him to avoid tell her more of these things? There is any conselour in your collegue that you can reach for help?

Don't know if any of this helps. But everything you told looks pretty awful! I imagine myself in your situation, and I would certainly want to run away from home! (I'm not saying this is a path).

You have done anything wrong, it's not your fault.

Hughs for you.