I'm so, so sorry you are going through this. Your despair screams from every line and I really do feel for you and the agony you are going through.
I can totally relate to your situation and can truthfully say there is hope for you. It seems as if you are an intelligent, self-aware person - while this very attributes can give you painful insights, they are also potential springboards to happiness, fulfilness and achievement.
The raw materials are there, is is just a process to use them positively.
Posting here and expressing yourself is a real breakthrough.
Well can I hear the sadness, the paralysing feelings you are having, but please, please try to start with a little self-care... maybe something as small as washing your face? I can't fully explain why but once you put even a little time into yourself, this positivity grows and helps you to help yourself.
Sorry if this is rambling, but please keep going, you are made of stars xx