Ozzy Osbourne can't stop worrying.

The Black Sabbath rocker - who has three children with wife Sharon Osbourne and three from his previous marriage - is constantly searching for something to be concerned about and feels uneasy if life is running smoothly.

He said: "I'm a born worrier. Fear is my best friend and worst enemy. I worry if I have nothing to worry about. I don't understand the way my girls work. Jack's cool and Louis is OK."

Although the 61-year-old star can't halt his concerns, he believes there are "greater powers" looking after him, but he does not attribute this to religion.

He explained: "I believe in a power greater than myself - I believe in nature more than God. When I got help for my addictions I didn't believe in God sat up there like Santa Claus on a cloud. I went with nature."

The singer - who along with Sharon and children Kelly and Jack starred in their own reality TV series 'The Osbournes' - has more time to indulge in his worries now after revealing he refuses to do any more work on television.

He told Britain's Metro newspaper: "My job is great so how can I retire from a job like this? I tell you what I don't want to do anymore - TV work. I hate it.

"They stab you with a smile on their face and then ask you for the knife back."