It’s a wheel of misfortune.

A 21-year-old man behind the wheel of a sailboat named “Vanna White” ran the boat aground in Montauk on Thursday — just one day after he bought it on eBay for $700.

Now the sailor, Matthew Hunt, who hails from land-locked Arizona, is homeless — because he planned to live on the vessel.

The unfortunate mariner said his heart was “in tangles” after the 26-foot Catalina sailboat, named for the “Wheel of Fortune” sidekick, ran aground near Shadmoor around 1 p.m. on Thursday when the engine died.

Captain John Kanavy from Sea Tow Montauk managed to pull the Vanna White back out to sea when the tide came in around 4 p.m. — but two hours later Hunt received the tragic news that it had sunk in Montauk Harbor.

“This is my worst nightmare,” Hunt told The Post through tears, calling the vessel “a unicorn” because he got it for such a great price.

“I was going into the wind so I turned on the engine, and all of a sudden, the engine quit and I couldn’t get it to start again,” he recalled of the doomed maiden voyage.

“I kept cranking her and cranking her and trying to get the engine working, and while I was doing that, these waves were coming over the boat, bringing me closer and closer to the shore,” he said.

“There were all these rocks below me and every time I hit a rock, my heart stopped because I thought there would be damage to the boat or it would capsize. I was absolutely mortified.”

The cash-strapped seaman said he bought the sailboat after he was laid off from his job working for computer company Intel in Ocotillo, Arizona, and told The Post he has sailed bigger vessels than the 26-foot Catalina.

Matthew said he bought a one-way ticket from Phoenix, arriving at La Guardia Airport on Wednesday, and had planned to live on the boat which he purchased for just $700 when the owner wanted to get rid of it.

“My home life is really not the best, so the boat is the only option I had,” he said. “I didn’t have a lot of money to my name.”

“I’ve been out of work for a while now and I’m looking for work at the moment. I’ve really got nothing so I’m trying to get back on my feet,” he said, adding he has a valid lifeguard certification.

The unlucky sailor said he was overwhelmed with gratitude for the locals who came out to help him when he ran aground.

“All these people have helped me tremendously,” he said, calling it “a crazy ordeal.”

“I only had her one day. Now she’s gone.”