Generally bodies of the Boing aircraft made with the mixture of glass and aiuminium to decrease the total weight of the plane. My doubt is " why all planes are not made with glass and aluminium mixture so that we can decrease weight of other planes and also increase fuel efficiency?"

Who says they're not.
Sweeping generalisations of this nature really don't help a constructive discussion.
Actually I think you'll find that most of the commercial air plane makers do use light alloys as well as carbon fibre and glass in the make up of their aircraft.