Madonna has admitted that she is a �crap mother� and that her work puts a great strain on her family life.

Madge, who is about to embark on yet another world tour made the confession during an interview with the E! Entertainment Channel in the US.

She said: �It�s a struggle to balance my career with my children. I�m always going, �Oh God, I�m a crap mother�. I want to get home and put my kids to bed.

�And then sometimes, if I�m spending a lot of time with my children, I think, �Oh God, I just want to be an artist.�

�I have a tremendous pain threshold. I work with a lot of amazing people willing to put in the extra hours seven days a week.

�I guess I always feel like there is so much more to do, so much to learn, so much to know.�

Madonna added that her nine year old daughter Lourdes is often frustrated by her fame: �Sometimes she doesn�t want me to come to certain things because she knows everyone is going to pay attention to me and then they�ll treat her different.

�She�s nine going on nineteen. She�s a bit of a disco queen herself.�

I wonder where she gets that from???

The full Madonna interview will be broadcast on E! Entertainment Channel on May 17�check it out.