welcome to PC.

I'm sorry you have so much difficulty with your parents.
A friend of mine has a similar sort of problem, her mum doesn't know how to help so she just gets mad.

It may be worth looking on line for descriptions of what depression is like and find one that rings true with you and show them that?
It's true though, families get into ways of reacting to one another and habits are hard to change!

Good luck, keep posting and I hope you find as much understanding here as I have.