I have told lots of people about it: relatives, professionals, etc. They often either outright pretend that they didn't hear me, or rudely ignore me and change the subject, or plainly tell me that I could never be suicidal because I don't look like a person who would commit a suicide which is blatant sexism and lookism. When people think of a person who would commit a suicide, they think of a balding 50-year-old divorcee with alcoholism and a gun. I don't fit their image of a typical suicide committer, so "I can't be one" jfl. Oh, and sometimes they threaten to throw me into a "psych prison", and maybe they have even thrown me.
If they listen to me and don't threaten me with "psych prisons", it's 15 minutes of "Please promise me you won't commit a suicide. Call 911 if you ever have suicidal thoughts." and other virtue signaling, after which they conveniently "forget" that I told them I'm gonna ctb soon, and the next time they meet me, they pretend like all is fine and don't bring up the fact that I nearly committed a suicide right in front of their eyes.
No one has ever shown any understanding for me irl. I wonder what's it in me that immediately turns other people into unempathic inhuman monsters while in my presence. Or maybe I'm just surrounded by evil people.