No you are not rubbish, a burden or a problem for others.
I have been working on telling myself I am not worthless, even though my illness tells me that I am. Try to push back when your illness tells you these things. It is hard, I am not worthless, I am not worthless, I am not worthless.
As for your boss - there are many people that do not understand depression - your boss sounds like one of them.
The harsh things your boss siad would hurt almost everyone. Your boss should not be aloud to say things like that to anyone under her / his watch.