I think there probably is some part of me that wants to get better, but I know things will get bad again because my mental health issues are chronic, and that makes me wish that I could go ahead and just decide to end everything now because if I'll be miserable most of my life, what's the point? but then I go back to being too scared to attempt, or feeling too guilty because either surviving an attempt or dying would be expensive and I don't want to do that to my parents, so I'm just going in circles feeling like I can't get better but I have no choice
I think I understand what you are saying. If so, I am all too familiar with that dilemma. It's the same cycle as you described - Life sucks - OTOH it would hurt the people I love, so I should get better - but I can't - life sucks even more!
So, at the end of the day I want to feel better. I can't feel good all the time but I can at least not feel miserable all the time. It sounds like you are ambivalent (as in strongly pulled in both directions) because there is no possibility of recovery for you, and yet you also fear for the effects of an intent, whether successful or not, that would result if these urges are acted upon.
This may very well be the case for you. I would not try to convince someone suffering from ALS that something unexpected right now could happen that would allow them to walk and talk again. It's definitely possible that some major scientific breakthrough could happen, but not realistic. In the same line of thought, I don't know if you can reasonably expect your suffering to ever get better without knowing the cause.
However, I know for myself that I can get better. Not all the way better, but I can take just one more step forward than I take backward. Progress is slow and definitely goes up and down, but over time the trend is encouraging. And that's what keeps me going for now. Maybe you can find something that works for you, too. I have a very hard time
not doing something because it would be bad. It's much easier for me to want to do something because it is good, i.e., the long term consequences put me in closer alignment with my values.
Now, if you'll excuse me, I'm off to do some things that feel good in the short term but do NOT put me in closer alignment with my values, lol.