To be more specific:
I have created a map in Pseudo-Mercator
EPSG: 3857 using Google Satellite.
So my layers, and my project, are all set to Pseudo-Mercator.
How can I create a map in print composer which shows me a right scale?
I mean, when I create a map of my area, I know that the scale is wrong when compared to official maps of that area (my map shows a smaller area of the world).
I cannot indicate the scale (e.g. 1/10000) because it is wrong.
What can I do? How can i create maps in typical scales like 1:10000 or 1:100000 which are correct?
I am using QGIS 2.18.2.