In-N-Out's reclusive 34-year-old heiress reveals shocking details about her family and relationships

The famously reclusive 34-year-old heiress to In-N-Out's fortune has offered rare insight into her personal life in a new video.

Lynsi Snyder, the billionaire president of the California-based burger chain and granddaughter of its founders, discusses her four marriages, the death of her father, and her past drug use in the 10-minute video, which was posted Wednesday to the website IAmSecond.com.

She said her father, Guy Snyder, battled drug addiction and was in and out of rehab facilities from the time she was five years old. He later had an affair, and her parents divorced when she was 12.

"It was really hard for me to see him fail and be weak because I knew how bad he wanted to be a good husband and good father," she said.

Around the same time, in 1993, her father took control of In-N-Out from his brother, who died in a plane crash. 

Her father led the company until he died of a prescription-drug overdose in 1999.

"My world shattered," she said. "After my dad died there was no way I was going to be alone."

Immediately following his death, Snyder married her first husband when she was 18 years old.

"It wasn't right," she said. "I paid the price with a divorce and jumped right into the arms of someone else."

Then she said she started smoking pot and abusing alcohol.

"At that point I pretty much realized I'm the outcast in the family," she said. "I figured I'm divorced - I might as well embrace this."

She said she worried she would "meet an early death" like her father, and eventually she got married again, had two children, and later had an affair. The marriage dissolved within six years, she said. 

"I couldn't feel like a bigger failure at that point," she said. 

She married for a third time and had another child with a man she claims married her for money and cheated on her for nearly four years before they divorced.

"The first time he cheated on me I thought, 'Well I deserve it,'" she said. "It was terrible."

Now, at age 34, she says she is remarried and has finally found peace through religion.

Snyder's grandparents opened the first In-N-Out in 1948. She inherited 50% of the In-N-Out's shares when she turned 30.

On her 35th birthday in May of this year, she'll get the remaining 50%, making her one of the wealthiest women in the US. 

Despite her public role as president of her family's beloved burger chain, Snyder is famously private.

She barely talks to the press. When asked last year during a rare interview why she's so secretive, she told CBS, "We don't want to be in the spotlight. We don't want a bunch of attention. It's not about us."

In-N-Out, which has 318 restaurants in six states, has been valued at $1.1 billion.

Her inheritance makes her one of the youngest female billionaires in the country.

Snyder's grandparents opened the first In-N-Out in 1948.

Watch the video.