For me, that's why I'm not leaving a note. IRL nobody really hears me, so my thought is "why bother talking now if you've dismissed me my entire life." It still baffles me as to why people think their values, choices, and preferences should be my values, choices, and preferences.
Once when I tried my own idea of alternate therapy, I asked the person to yell at me and then hold me so that I can learn that when someone is mad at me or I do something wrong, it's not permanent. They said they felt uncomfortable yelling at me. I said "okay." And then my eyes opened up: "Wait--it's that easy to accept someone's boundary?! You didn't have to defend yourself or face question after question about why you think the way you do. JFC, why can't people accept my boundary?! I've literally been told that I'm "not allowed to say No."
So, it's not a surprise that I'm so quiet; talking does no good. And if I wrote a book about my life, it wouldn't be surprising that I finally gave up and left this world. I don't really understand people.