On her 33rd birthday, Meghan Markle gave herself some life-changing advice.

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Tomorrow, on August 4, Meghan Markle will celebrate her birthday for the first time as the Duchess of Sussex. No doubt, now that she has married into the British Royal family, the way she spends her big day will be extremely different to previous years.

But a look back on an old blog post of Markle’s proves that you would be mistaken if you thought she wasn’t just as happy, four years ago when she was single, explaining to her readers that she was extremely content with the life she had built for herself at the time.

Courtesy of the Wayback Machine, which archives old internet pages, we are able to look back on Markle’s old blog, The Tig, which reminds us once again that she was an intelligent, extremely successful woman in her own right, prior to her relationship with Prince Harry.

But before we get to the heartening contents of her blogs, are you also wondering why it’s called The Tig?

Markle explains on the website’s “About” section that the name emerged when she was sipping on a glass of wine, Tignanello, when she experienced one of those delightful “ah-ha” moments.

“So there I am, with very minimal wine knowledge and I take a sip of this wine. It wasn’t just red or white – suddenly I understood what people meant by the body, legs, structure of wine,” the now Duchess of Sussex said.  “For me, it became a ‘Tig‘ moment – a moment of getting it.”

“From that point on, any new awareness, any new discovery or “ohhhhh, I get it!” moment was a “Tig” moment. At New York Fashion Week understanding that clothes aren’t just pieces of fabric, but that they can be art. So Tig.”

She also explained that this site was designed to be “a hub for the discerning palate – those with a hunger for food, travel, fashion & beauty.”

One of the more inspiring posts she wrote came on her 33rd birthday, when she wrote a letter to herself.

"I am 33 years old today. And I am happy. And I say that so plainly because, well…it takes time. To be happy. To figure out how to be kind to yourself," Markle began the blog post.

She explained that her happiness came after years of struggling to fit in, saying her twenties were "brutal" and her teen years "were even worse" as a biracial girl in Los Angeles.

"My high school had cliques: the black girls and white girls, the Filipino and the Latina girls," Markle shared with her readers, which she affectionately called her "Tig friends".

"Being biracial, I fell somewhere in between. So everyday during lunch, I busied myself with meetings – French club, student body, whatever one could possibly do between noon and 1pm- I was there. Not so that I was more involved, but so that I wouldn’t have to eat alone."

About her twenties, she explained they consisted of "a constant battle with myself, judging my weight, my style, my desire to be as cool/as hip/as smart/as 'whatever' as everyone else."

The post continued by revealing that since she entered her thirties, she had finally come to the realisation that "I am enough."

Markle, who will celebrate her birthday on August 4, said that she now knows "that five pounds lost won’t make you happier, that more makeup won’t make you prettier, that the now iconic saying from Jerry Maguire -”You complete me” – frankly, isn’t true. You are complete with or without a partner.

"You are enough just as you are."

As Refinery 29 pointed out, watching Meghan Markle wed Prince Harry on May 19, many of us assumed that the 36-year-old would have achieved a level of happiness unprecedented in her life thus far. But this post proves that Markle was just as happy three years before, when she was single and living on her own.

Markle said farewell to the lifestyle blog in April 2017, nine months after it was revealed she was dating Prince Harry and seven months before their engagement was announced, as she began making the transition from Hollywood actress to member of the British Royal family.

She parted ways with her readers with the sweet message that reminded her followers once again, "Above all, don't ever forget your worth - as I've told you time and time again: you, my sweet friend, you are enough."

The Mamamia Out Loud team discuss why Meghan Markle is the role model young women need.