Prince Harry was once so disillusioned with being part of the Royal Family that he decided he "wanted out".
Having considered giving up his title, he finally decided he should remain and "work out a role for myself".
Speaking to the Mail on Sunday, the prince - who is fifth in line to the throne - said being in the Army was "the best escape I've ever had".
And he said the royals "don't want to be just a bunch of celebrities but instead use our role for good".
Harry, 32, spent 10 years in the Army, serving twice in Afghanistan.
He had to leave when his presence there was revealed by the press in 2007.
"I felt very resentful. Being in the Army was the best escape I've ever had. I felt as though I was really achieving something.
"I have a deep understanding of all sorts of people from different backgrounds and felt I was part of a team."
Prince Harry: No-one wants to be king
He has since been closely involved with charity work, including supporting wounded veterans and mental health groups.
"We are incredibly passionate with our charities and they have been chosen because they are on the path shown to me by our mother," he said.
"I love charity stuff and meeting people."
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