Simon Cowell has revealed that despite (or perhaps because of) his success, he finds it hard to be happy.

The X Factor judge told the Daily Mail recently: “If I went to a psychiatrist, it would be a long session. I’ve always thought that I do have a number of issues that probably need dealing with, because I am quite odd in some ways.

“I get very dark moods for no reason. Nothing in particular brings it on.

“You can be having the best time of your life and yet you’re utterly and totally miserable. I get very anti-social, depressed and irritable with people. I don’t have time for them. I can’t make phone calls and stuff. I just sit on my own for days. I’m not sitting in a darkened room rocking.

“My loneliness is self-imposed. I can go through a few weeks where every single text or phone call starts with the word ‘why’ - ‘Why haven’t you called me?’ ‘Why aren’t you speaking to me?’. It’s because I just want to be on my own for a while.

“Things might have gone really well and then I torture myself. I cannot believe it. I have to find something to make me miserable.”