Greetings @ariani - this does not appear to be an Agaricus. Can you add a shot showing the underside of cap and upper stipe and one of the base of the stipe. Also is it in an urban or forest setting. And what is the overall size? Through the slight peek at the gills from the crack in the cap plus my assumptions about habitat and size etc, perhaps a Leratiomyces.
Here's one of many handy ID graphics, that you may find useful. This one is from USA by Mike Cherry. Also here's a link to a more comprehensive list in this forum; https://forums.botanicalgarden.ubc.ca/threads/tools-for-identifying-mushrooms.44106/
