Leave random family sharing in iCloud
I can’t leave the family sharing because it linked to some random Chinese persons iCloud they probably hacked me
iPhone 14, iOS 16
Apple's instructions indicate that you can remove yourself from a Family Sharing Group (unless you are under 13):
Leave Family Sharing - Apple Support
They also say you have to accept an invitation to join a group:
Add family members to a Family Sharing group on Mac - Apple Support
Add a member to a Family Sharing group on iPhone - Apple Support
Either way, if you are having difficulty leaving a Family Sharing group get in touch with Apple Support.
There is also some important information in the support document If you think your Apple Account has been compromised - Apple Support