Prince Harry has said "incessant" intrusions into his private life have made the line between his personal and public affairs "almost non-existent".
The young royal said that "everyone has a right to privacy" and interest in him verged on "unnecessary".
He told the BBC's Andrew Marr programme that he intended to use his family's "very privileged" public position to promote good causes.
The Prince said: "Sadly, that line between public and private life is almost non-existent any more and we will do our best to ensure that there is a line.
"We are completely aware that we are in a very privileged position and I will spend the rest of my life earning that privilege and trying to bring a spotlight on to things and causes that really matter to me and hopefully matter to a lot of other people as well.
"Everyone has a right to their privacy and a lot of members of the public get it, but sadly in some areas there is this incessant need to find every bit of detail about what goes on behind the scenes."
The former Army officer is currently in Florida for the opening of the Invictus Games. His championing of injured veterans' causes echoes the commitment to charity work of his late mother, Diana, Princess of Wales.