If I were you I would spend some time doing some daydreaming, maybe with some Barbara Sher books (library should have them, start with Wishcraft as it's the basis and the other books just sort of add on) http://www.barbarasher.com/

I would blame the retail jobs for most of my depression and actively look for what I wanted to do; what do you have to lose, you don't have a job now and don't feel you can look for one so use the time to "entertain" yourself by educating yourself as to what you would like, if you could like something?

My sister was a biology graduate in 1959 and in the 1990's, after not working all those years, had to figure out how to get a job. She went back to school to get her RN but did not like the studying so dropped out. But now she works for an NIH project, supervising the data collection for experiments. She worked before/after going to school by starting her own wallpapering/painting company (until she got "too old" and her back was not happy with that) and also as a aide at an assisted nursing facility. That helped us a whole lot when our mother needed such a facility, she was able to get her in that facility, which was close to her home, etc. and was a wonderful place.

Remember, you may feel depressed but the world does not :-) There's lots out there that is possible, could be interesting to do.