Not everything went the way of Dustin Poirier during the course of his first 17 years as a professional fighter, chief among them falling short three times in his bid to become the undisputed UFC lightweight champion.

But as the all-time great 155-pounder prepares for his final MMA bout — “the last dance,” as he calls it — he is a man who has peace with what he did and did not do in the cage, in large part because he knows he gave it his all.

“I did everything I could to become undisputed champ,” Poirier told The Post during a recent video call. “I put myself in position multiple times to get my hand raised and win that belt in the UFC and just fell short. Just got beat by really good guys, made mistakes, and it is what it is. That’s life; that’s my story.”

The last chapter in the tale of “Dustin Poirier: Professional Fighter” comes Saturday as he headlines a tailor-made event in his backyard, facing fellow legend Max Holloway for the third time in the UFC 318 main event in New Orleans.