Nearly 20 years after Princess Diana's death, her younger son, Prince Harry, has opened up about the tragic loss of his mother — and revealed he struggled with mental health issues following her passing.

Diana sadly died in a car crash in Paris on Aug. 31, 1997, when Harry was just 12 years old. And after 20 years of trying to not think about her passing, the red-headed royal admits he's finally starting to deal with it, specifically by attending counseling four years ago.

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Diana and Hary in 1988.

Prince William's brother sought professional help when he was 28 years old after enduring "two years of total chaos" in his life. "I didn't know what was wrong with me," he revealed in a candid new interview with The Telegraph. "[I was] very close to a complete breakdown on numerous occasions."

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"From an emotional side, I was like 'right, don't ever let your emotions be part of anything.' So, I was a typical sort of 20-, 25-, 28-year-old running around going 'life is great, or life is fine,'" Harry confessed.

"Then I started to have a few conversations and then, all of a sudden, all of this grief that I'd never processed came to the forefront. I was like, 'there's actually a lot of stuff here I need to deal with,'" he continued of the sessions, which he was encouraged to attend by William.

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Diana and Harry in 1986.

Luckily today, Harry shares he's in "a good place" after years of trying to forget about Diana's untimely death. On Wednesday, April 19, Harry made his first public appearance since the candid interview — and revealed why he spoke so deeply about the topic.

According to E News, at the 2017 Virgin Money London Marathon Expo, he revealed, "I've shared, just as much as everybody else has during this campaign. And after how many years of listening to stories from veterans and their families and then specifically in this campaign, William, [Kate Middleton], and I hearing some of the most heart-wrenching stories based around what people have experienced and then the mental anguish that's happened from then, it was only right to share my experiences to hope to encourage others to come forward and smash that stigma, to make it easier for them to talk about their own experiences. So I was just doing my bit."

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He concluded, "When you've heard so many stories from so many other people and if you can relate to that then it's only right that you talk about your own experiences."

Click through the gallery below to see Diana’s cutest moments with her sons, Harry and William!