I know how u feel, i really do. Im not sure because i really dont know u and if u are clinically diagnosed but according to how u describe ur feeling in this comment u r not depressed there is term for this rather than depressed. But my question for u is are you really finding your passion? I really dont know u but based on my personal experience where id feel like i didnt belong anywhere. U might be just using your "depression" as an excuse to dwell. If u cant find ur passion then make it yourself.
I relate! I don't have depression though, but sometimes getting out of bed and putting on a mask is just so tiring. I suggest maybe venting out from time to time to not explode and break down.
I don't know if any of my advice may help but I hope you find inner peace someday! (=・ω・=)
I'm dealing with depression too and I really relate to the MC. Finding passion or drive is incredibly hard and I can't help it much since my brain is literally working against me. I also really felt the same when she said she'd wish to disappear. I feel like that's something that I've been constantly thinking for maybe the past year or so..
If I were isekaid like MC I would probably do the same things, I might've even snapped at the king a couple times because some of his actions have been annoying but I know he's trying to help.