How did a person managed to change my settings without physical access?

Nobody changed your settings. Without physical access, and knowing your passcode and password, nobody can access your device. The iCloud settings allow for syncing across devices, it is not a backup setting.

my phone says my location is somewhere else, screen sharing enables but don’t allowed me to see who is sharing screen and a Mac computer address shows on settings. I only have a phone an Iwatch and I stop caring for technology since in my case is not teaching me anything pasitive but realizing there are real KOOKs out there with no morals and false education.

Cprivacy wrote:

my phone says my location is somewhere else,

it may based on the address provided by cellular companies, nearby connection points, etc. that’s not really an issue. If I use my device at work, it shows me on the east coast, not the southwest where I work.

screen sharing enables but don’t allowed me to see who is sharing screen

you would need to turn it on and positively accept a screen sharing request. What color band is displayed across the top of your screen when sharing?

and a Mac computer address shows on settings.

yes, nearly all computers and networking device have MAC addresses https://en.wikipedia.org/wiki/MAC_address