Depression is not wanting to leave your bed &amp; to avoid the world outside. Depression is a hallow void in your chest that weighs you down to the point of feeling you are going to dissappear at any moment. Depression is a heavy fog within your mind and a paralyzing "I can't do it" or "I don't have any place in this world, just leave me alone." 

What I am confused about is how does emptiness in borderline suffering differentiate from depression? I understand emptiness to be the cause of those with bpd to act out or act in, emptiness is what drives the impulses and addictions. It is what causes one to never know where their true direction is in the world. 

But how do you differentiate from knowing if you are depressed vs empty? what if you don't feel depressed but you just can't figure out what is going on inside your mind or emotional body. You can't figure out what you want in relation to who you are. You know you are alive but you feel disconnected from really being alive. You space out into the void but it is not a void of sadness it is a void of not knowing what is going on inside you. You see yourself in the mirror but you can't seem to relate in your mind your reflection to being you. You're always searching for ways to distract yourself because if you weren't you'd be an empty shell that does not budge an inch. Is this depression or emptiness? 

I feel I understand to a certain extent. I see emptiness as the driving force for external actions of desperation / self harm / possibly the splitting(?) except I can also see depression as a driving force for that or I could be completely wrong. How is it different?