Billionaire Entrepreneur Mark Cuban: 'Failure is Part of the Success Equation'Falling down and pulling yourself back up only makes you more kickass at business and in life, the Shark Tank star says.

ByKim Lachance Shandrow

Opinions expressed by Entrepreneur contributors are their own.

"I failed."

Those are two words you might not expect fromMark Cuban,Shark Tank's only billionaire judge. But he's had his share. Take, for instance, when he tried selling powdered milk. It was a swift lesson infailure-- about as fast as reconstituting powdered milk with water. "I honestly thought it would make a killer business and it lasted minutes," he says.

Related:What Would Mark Cuban Change About His Career?

The Dallas Mavericks owner and tech industry titan told Entrepreneur.com on the set of the popular startup pitch show that he's gotten fired from "more jobs than most people have had." He's also failed to close several key sales deals, has had his credit card rejected and cut up on a date, and he's opened and closed more businesses than he can count.

Still, the scrappy, six-foot-three serial entrepreneur and investor never once gave up on his boyhood dreams, sparked at the age of 12 when he decided to sell trash bags door-to-door to be able to afford basketball sneakers.

Cuban says he's thankful for every stumble and fall he fought back from on his at first bumpy, then absolutely meteoric rise to success. "It doesn't matter how many times you fail. Each time only makes you better, stronger, smarter and you only have to be right once. Just once," he says. "Then everyone calls you an overnight success and you feel lucky. I still feel that way."

Related:Mark Cuban: There's No Playing Nice With Your Competition

Obviously Cuban -- who made his first millions when he sold his computer consulting firm Microsolutions to CompuServe in 1990 -- is doing something right. An estimated $2.3 billion dollars right. That's his estimated net worth at the moment. It's likely more than he could possibly spend in a lifetime, though he says he's trying.

"I wouldn't be where I am now if I didn't fail... a lot. The good, the bad, it's all part of the success equation. I reallywouldn't change anythingat all."

Catch Cuban in action onShark Tanktomorrow when the show's sixth season premieres on your local ABC station from 8 to 10 p.m. ET/PT.

Related:The Hard Truth of Entrepreneurship: You Will Suffer

Kim Lachance Shandrow

Former West Coast Editor

Kim Lachance Shandrow is the former West Coast editor at Entrepreneur.com. Previously, she was a commerce columnist atLos Angeles CityBeat,a news producer at MSNBC and KNBC in Los Angeles and a frequent contributor to theLos Angeles Times. She has also written forGovernment Technologymagazine,LA Yogamagazine, theLowell Sunnewspaper, HealthCentral.com, PsychCentral.com and the former U.S. Surgeon General, Dr. C. Everett Coop. Follow her on Twitter at@Lashandrow. You can also follow her on Facebookhere.

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