Ex-Wrestler Matt Hardy -- I'm NOT Suicidal!!!

Former TNA wrestler Matt Hardy is NOT in the middle of a suicidal crisis ... despite a cryptic message he posted on YouTube starting with, "Goodbye, World" -- and ending with, "September 23, 1974 - August 31, 2011."

Hardy -- who was busted for DWI earlier this month and fired from TNA -- posted the message late Tuesday ... but when TMZ contacted Hardy he was fine.

Hardy was apologetic saying the post "was not in any way a suicide note. I want to reassure everyone that I am doing great right now."

Matt believes the statement was really about his last 2 weeks since the DWI arrest -- and that he feels it's time for a change. He adds, "I went from being the guy who wanted to change the world, entertain and inspire people to being someone who was more concerned about shock value."

He claims the YouTube post is the last of his over-the-top antics and he's going back to the "Old Matt Hardy."