I have a question. You don't have to answer it if you don't want to.
Is it possible that you tend to be reinforcing the sadness because of what you surround yourself with? Say for example, you listen to a lot of metal, and you watch a lot of anime. These are interesting fandoms, and have a lot of things that might be fun. However, I was looking at a pattern from the outside here. This isn't picking at you, but it's definitely a pattern I've seen a few times before.
Is it possible that listening to sad or depressing music might be contributing to helping you stay depressed?
Ok, I don't listen to music that is exactly cool. I' have, however, found my old teenage "depression playlist" when I found some really old records awhile ago that I used to play as a suicidally depressed teenager. I spent most of my time in my room anyway. I played jazz records, foxtrots, ragtime marches, regular military-band marches, comedy songs, Negro spirituals, classical music of all descriptions, blues, the beginnings of R&B. Notice the lack of gloomy or angry music. I don't actually think I have any music tailored to sadness.
The funniest part is that I've become less depressed over time, even though there were some serious set-backs (I'm going through some since about late last December.) It's working out, slowly. I know for a fact that listening to intensely sad music doesn't help me--it fragments my thoughts & I can't get out of things.
Also, regarding anime/manga/any of that sort of thing. I understand that it may seem like a good idea to enjoy some escapism here but the relationships portrayed in anime & suchlike are hilariously inaccurate, just like the proportions of female bodies in anime are hilariously inaccurate. (I went and looked at some anime. Interpersonal interactions in a lot of the mainstream stuff are just bizarre. I've seen a few that were legitimately nice, like Super Cub, but that had more exploring on a Honda motor bike and less unrealistic weirdness.)
The combination of media made by the lonely and lecherous, plus the intense, emotional hit of metal music but without the fun side to balance it out, might be a little bit rough for you and it may be limiting your chances.
I was really depressed for awhile and, to keep on keeping on, I sat down & decided to learn a piece of light music in 6/8 time for the organ. This was genuinely helpful. I like to keep my musical intake pleasant, light, and fun, not stormy and depressed. The same thing happened in the Early Romantic era, when Goethe wrote The Sorrows of Young Werther--the first edition spawned a rush of copycat suicides when a lot of chronically depressed German youth decided they should do exactly what Werther did in the book: i.e., die. Goethe was horrified, and, very sorrowful himself, wrote a new preface to the next edition recommending please do not actually kill yourself, because the whole sad boi thing is overrated, and this is a work of literary fiction so it's supposed to be sad or gloomy or some something like that. I don't know what his actual words were as I do not sprechen da Deutsch.
The whole thing just seems like it's a little too reinforced--you're not fond of your job and your mother's overbearing influence isn't fun, but then you surround yourself not with happiness but with sad, angry music and unrealistic anime interactions (and unrealistic anime cleavage.) If I were you in your position, I'd be trying to do something different. Not saying to go full weirdo '80s mom and dump your metal collection, or to get rid of everything you're actually interested in, but I would suggest that maybe broadening your horizons would give you a chance out.
And I'm fully convinced you'll probably think I'm one of your "detractors" now. Look, if I had de tractor running maybe I'd fix the dirt road on de back forty and wait for de winter, oil de rifle, take de long walk and hunt de deers.