Meghan Trainor became a household name in 2014 with her debut hit single All About That Bass, but it turns out the chart-topping song derived from heartache.

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On Friday, Daily Mail Online exclusively released interviews with the singer's family and friends, detailing where the smash hit came from.

All About That Bass has topped various charts, including the Mainstream Top 40 one, in which it peaked at no. 1.

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Trainor's father Gary revealed, "I consider Meghan to be normal size, but when she was younger she was self-conscious about her body."

He further stated that Trainor wouldn't attend pool parties since "she didn't want to be the only girl in a one piece swimsuit when all the others were in a bikini."

Tranior's dad and mom, Keli, always encouraged her that she looked just fine.

Gary commented, "My wife Keli and I told her she had nothing to be worried about, but she was aware of her size. Most girls are very body conscious and Meghan was no different to others."

One incident from when Trainor was 13 played a big part in the creation of All About That Bass. Trainor had been flirting with a boy at school and he told her he'd only date her if she lost 10 lbs.

Trainor's friend Ashley Symer said, "She was crushed by that and in tears. Meghan was conscious about her size. She wasn't fat but she was a big girl.

"She was in tears because it was so hurtful. No girl wants to be told to lose weight. It was really crushing for her," Symer shared.

Symer revealed Trainor eventually realized she didn't have to change and Gary revealed his daughter never expected All About That Bass to become a "touchstone," but Trainor feels strongly about body image.

He added, "I don't think she expected to start a cultural conversation around the world about women's bodies and how people look. But some parts of the song are obviously about her."

Other friends shared Trainor was skeptical that she'd never make it in the industry because of her size, but Symer revealed once Adele made herself a household name Trainor was ecstatic and thought she stood a chance.

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Meghan Trainor