I have a bit of a unique perspective- though not necessarily an important one.
I have tried S- survived (who knows why?, survived 'much', in fact, and have no clue 'why' for that, either, really), but in the long run was glad of that specifically because it would (at that time) have caused terrible unnecessary suffering for my mom.
After many years without it, I had SI come back with a vengence. 'Why' I survived that, specifically, I also have no idea. But it did get better.
I also stumbled (I mean literally) over a book (at that time) called "How I stayed Alive While My Brain Was Trying To Kill Me". -So true.
And it also got a lot better (and made a lot more sense) when viewed as just another symptom of ptsd.
I have a family (genetically) thaty has pretty much all died off of cancer- I'm long 'overdue' (statistically), at my age, but I'm still 'here'.
I did not get married, and specifically chose not to have children, to a great degree because of that. For me, personally, I never wanted to have to leave a spouse dealing with (my) death, whether by cancer or suicide, because I have gone through others' deaths, nor to leave children especially having to deal with it, or a spouse left to raise them alone- with risk of 'no one', if they themself died, let alone if I passed a 'cancer gene' to my children.
I do truly believe suicide causes gross suffering for anyone who loves you- a spouse, family, etc- for children it is and would be absolutely devastating, and they would blame themself, as would most parents.
I do believe in God- but a compassionate one- and I don't think He'd give anything but compassion to those at their wit's end.
I definitely have more fear of 'living' than 'dying'.
I also don't believe that it is often 'selfish'- especially when you consider dissociation, and/ or constricted thinking. Constricted thinking alone indicates (anyone) can't see a full and clear picture, at the time. Let alone necessarily make rational decisions in their (or other's) best interests.
When I was suicidal, sometimes I couldn't remember even other people 'existed'- no memory at all. And sometimes when I could remember they 'existed', I couldn't retrieve a single memory of time spent together- just a 'blank', no matter how hard I tried.
But maybe that's the point? When you combine being at your wit's end, without purpose, and having little fear of 'worse', suicide doesn't look like such a bad idea. In fact, feeling like a burden, it's a preferable one.
But you also have the right to make other choices- removing what is toxic and replacing it with what you love. Because all any one of us has is 'this' moment- nothing beyond that is guaranteed.
I don't mean to sound preachy- and I do 'get it'. 'Intimately'. But I do believe you're here for a reason- posting here on this forum already helps so many people. The fact that you understand makes you invaluable to those who need that understanding but are surrounded by those who don't understand.
And I'm guessing, that you likely do have people who love you very much, but do not know how to help, but that would be devastated if you were gone, just as you would be if someone you loved died.
I like the saying a veteran on here said- "Suicide is not a treatment option".
Needless to say, I hope this alleviates for you, as it's truly a horror to live with, that you can talk to someone, find concrete ways to not have to feel like this, and that you find peace.