For me thinking about suicide is a way of scaping my problems, it makes me feel in control of my life and I find comfort in having a way out of this life I hate. Maybe the question shouldn't be "why do I want to ctb" and instead be "why do I suffer" or "why do I hate living".
If you are trying to find meaning and maybe stop being suicidal I recommend, from my personal experience, going to therapy (if you can). Keep in mind that if they think you'll ctb soon they may intern you in a psych ward.
I say I recommend therapy but I'm still suicidal lol. I recommend it because it has helped me find meaning to a lot of emotions and intrusive thoughts. However, now that I want to ctb sooner rather than later, I'm finding myself lying and pretending to be better so I don't get locked up.
I hope you can find peace of mind and answers soon ❤