The 39-year-old star said: "I am not at that stage and I might never have a 2.4 nuclear family - but I don't know that that makes me any less fulfilled or happy than anybody else. This is the only life I have. This is the one I know. I can't be in someone else's shoes."
The self-confessed workaholic - who has just released her new album 'X' - recently revealed she is planning to take time off to travel around the world.
She said: "I am getting good at trimming things down and good at saying 'no'.
"Doing this album was an affirmation, a reaffirming that I actually like doing this. But after this is done, maybe I would like to grab a backpack and go."