A new book says that Michelle Obama felt isolated, frightened and unsure of what to do during initial days at White House.

The Obamas, a new book by New York Times correspondent Jodi Kantor has asserted that despite her husband's historic win in the 2008 presidential race, Michelle Obama was in favour of staying put in Chicago with her girls and not shifitng to the White House.

She was apprehensive about her children bumping into White House tourists during play dates. Later, she would acknowledge just how tough life at 1600 Pennsylvania Avenue can be, ABC News reported.

"Sometimes it becomes difficult to live in what we call a bubble,' she said, according to the book. It was a trip to a London girls' school, which eventually proved to be a turning point for the First Lady, where she discovered a public role for herself and evaded the isolation she felt at the White House

"We are counting on every single one of you to be the very best that you can be,' Obama told them.