A few ways Google personalizes results:
Ways to turn off personalization
WHO CAN SEE MY STUFF
Future Posts: Make sure it is not Everyone. Friends should be fine. You can get more specific if you like.
Activity Log: Helps you quickly locate photos you are tagged in and remove yourself if needed. In the photo, go to Options, Remove Tag.
View As: Very helpful, can see how your timeline appears to others.
WHO CAN CONTACT ME
Choose who can send friend requests.
HOW DO I STOP SOMEONE FROM BOTHERING ME
You can block people.
SEE MORE SETTINGS
Security: Change your name, password, nickname, etc.
Privacy: Let's you restrict things like who can see your posts and who can Contact you. Turn off Search Engines to remove your Facebook profile from Google.
Timeline and Tagging Settings:
Blocking: Block apps, users, invites, etc.