I really appreciate you opening up, B.D., and don't hold back out of fear of people making fun of you.
re: library science, I actually considered it myself a while back, but don't go to grad school just because it's there. But don't underrate your English degree, either. Speaking as a fellow humanities undergrad (history), I just went back to school in my 30s, and I found that there's real value in having experience in a major where you're just expected to read and write all the time. Even the most interesting jobs are filled with things like memos and reports, and people on average are really, really shitty writers.
If your depression is really situational, I'm speaking from my own psychology here, but you might find that if you can establish a "quest" for yourself (be it going back to school or some other endeavor) it'll end up coloring all of the leisure aspects of your life positively, including listening to music.