You have a brain that is modular. None of it is self aware. Different parts take different inputs, operate on them differently and have different outputs. When a decision needs to made, a sort of 'weighting' is carried out.
The brain has evolved to ensure the genes get passed on. To do this well, it identifies itself as a single entity, though it is composed of many.
This is no different than being able to identify chairs or stars.
After I die I will not be in a state of no-awareness, as there is no such thing as "after I die". So I don't even understand what death is in the context of awareness.
Death is just one end of "your" "awareness" in the time dimension. Birth is the other.
"You" is {yes, "is" not "are") a useful fiction created for the purposes of maximising the copying success of your genes. It is easy to think magically when it comes to 'awareness'. I'm wondering why the various configurations self awareness is different enough to warrant these questions...
I mean - do you ask these questions over the paramater space for leg confirgurations?