It's a world in which you are intensely aware of your relationship with
Allah, and aware that everything in the world exists because Allah
chose that it should.
This gives life a whole new meaning, it lifts many responsibilities,
and replaces them with the single aim of living life in the way that
Allah wants you to live it.
So when you become a Muslim you have to live Allah's way. Every moment
of your life has to follow Allah's will. Every choice you make must be
the choice that would please Allah.
To someone brought up in the modern, Western, "Me" culture, this sounds
pretty constricting. A Muslim would disagree, big time.