Ok good to see you've been in therapy for a while.
You clearly have a very low self-esteem, if you have no idea how to get to a point of emotional awareness, or what self-care means, or what "processing emotions" means or any of that, it means you have a great period ahead of you, because this is something you can learn.
This is going to take some effort on your end, but it is going to be effective in the long-run. Read, read, read, read, read, read, read, read, read, read and read. Discuss what you read with your therapist.
Based on what you've written so far, I'd recommend starting with "The body keeps the score". I'm not sure what your story is, but other great book candidates may be:
* Running on empty (childhood emotional neglect) -- childhood emotional neglect results in people who are unable to process or even feel their emotions, who feel empty all the time, and have no idea why. Childhood seems normal; had food, had parents, had housing, had friends, had birthday parties, never been hit, etc... The problem is not about what _did_ happen, the problem is about what _didn't_ happen. If you've never experienced what it's like to be cared for, then you won't know that you're missing it now.
* CPTSD -- not a book, just a topic you should study. Self-hate, extremely low self-esteem, "this great beast which screams at me every night" all point to abuse, it doesn't matter if it's extreme abuse or not, or that you may reject the idea of being abused; the result is clearly there.
reddit.com/r/cptsd is fairly decent resource
* Feeling good by david burns -- This is a book about depression. It won't resolve your depression or your problems, but it is full of helpful exercises and insights that are a great supplement to your therapy and other books.
... more to come (2000 word limit)