Brad Pitt worries he doesn't spend enough time with his family.

The 'Moneyball' actor - who raises six children, Maddox, 10, Pax, seven, Zahara, six, Shiloh, five, and three-year-old twins Knox and Vivienne, with partner Angelina Jolie - says his priorities have changed since he became a father, and he is always fretting he isn't at home enough.

He said: "My concerns are all with family and their safety. Am I spending enough time with them, and am I giving the opportunity and instructions that are important to them? Am I getting that right? Once family comes along, it becomes a matter of life and death."

Although Brad and Angelina have been in a relationship since 2005 they currently have no plans to marry because Brad believes raising children together is a bigger commitment.

In an interview with the Daily Telegraph newspaper, he explained: "Angie and I talk about it. We've already made a bigger commitment and that's raising a family together so everything else is secondary."

While Brad is content with his personal life, he admitted he sometimes wishes he was slightly less famous because he always has to sneak in the back door of hotels to avoid fans and the paparazzi.

He explained: "I haven't seen a hotel lobby in 15 years; I have to go in the back door and out the same way. I've been in cities for 48 hours and the only time I've been out was when I walked across the street to the premiere of my movie. But it's a trade off and we get our moments."