Joe Hart on his Burnley struggles: "It's certainly the lowest point of my footballing career but it's not a dark cloud. "I'm comfortable with what's going on."
But the former England keeper says he is treating it as a "challenge".
He is currently playing second fiddle to Nick Pope, after spending the second half of last season on the bench, after the return of club captain Tom Heaton.
Hart hasn't played in the Premier League since a 5-1 defeat at home to Everton on Boxing Day 2018, and he said: "It's certainly the lowest point of my footballing career but it's not a dark cloud.
"I'm comfortable with what's going on.
"Yeah I'm sad, yeah I'm disappointed that I'm not playing, because I know what I want to be, I know where I should be, I know what I can bring to the game.
"At the moment I'm not being picked, simple as that.
"You know, at school, not being picked...and that's hard. I feel like right now could be a real dark time for me, but it's not, I see it as a challenge."
Hart also talks about the impact not feeling wanted by Manchester City boss Pep Guardiola had on his mental health.
Hart, 33, fell out of favour under the Spanish coach in 2016.
Guardiola favoured Claudio Bravo over him primarily because he felt his ball-playing skills were stronger to build from the back.
Asked by the Prince what had been the biggest whack he had endured in his career, Hart said: "It will sound pathetic but it's the truth, it's not playing and not being wanted.
"Things happened with the new manager at Manchester City, probably the most important manager in the world.
"He didn't even necessarily not like me, he just had a certain aspect which he didn't feel I was up to, and it kind of dropped from there."
The Prince, who is president of the Football Association, is heavily involved in the organisation's 'Heads Up' campaign which works to promote around mental health awareness.