As much as I hate it, I have to work. I mean, I have to work because otherwise I can become very depressed and withdrawn and slug-like.
I think the bookstore idea is great, Juniper. Do something like that for a while, then take the time to decide if you're ready to go for your master's degree.
I think the depression tells you "you must do something significant NOW or you have failed." That is not true. Do what you want and can. Work in a bookstore. Get your master's degree. Don't pressure yourself to make the exact "right" decision.
I think you should get your master's so I can be jealous. I'm too lazy to do that.