Because you live in the Northern hemisphere.
If you lived exactly on the equator (and the planet didn’t rotate at a tilt), then the sun would rise directly up, be at the exact centre of the sky at midday, then set directly down in the west. Because you’re in the north, the sun rises and sets at an angle, and the midday sun isn’t directly overhead, it’s to the south.
While it’s true that the sun rises at the east and sets at the west, the reality is a bit more complicated than that. The “path” the sun travels through the sky varies depending of the day of the year. [This is a representation of the paths the sun takes](https://www.maa.org/sites/default/files/images/upload_library/46/Barnett_Misseri-Calendar/Sun_Path_Rome%20_Misseri_Calendar_Article.png) at June, December and Equinox (September and March) in the northern hemisphere (we’re in the middle of the sphere). If you’re outside the tropics, the sun never will be truly above your head, it will always be towards the Equator.
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