Simon Cowell has told Oprah Winfrey in a 'Master Class' TV interview that he is "selfish and quite weird", and this is why he thought he would never marry. 

Cowell also reveals: "Mish (Mezhgan Hussainy) has softened me. She's helped me see the world differently. She has knocked my socks off. I'd never been good at relationships. I never thought I'd be with one person - now I think I will."

"I genuinely believed no-one would want to marry me. I am difficult to live with. I'm selfish, quite weird, and I need time on my own to think - and then I work all night long. For instance I'll start viewing tapes at 10 o'clock at night, phone London and have conversations for hours and finish at 4.30 in the morning. 

"Doing these shows is relentless. When the ratings come in you're happy for five minutes then insecure madness comes in, and you worry about next week. The minute I think we can't do better I'm out."

The programme will be aired on Winfrey's new OWN network tonight (January 23).

Watch a trailer for the 'Master Class' series below: