Numbers from my address book being shown

I feel trust is a big part of a relationship. Im a private person by nature and Ive been that way for years. If she can see my call log on the account then others can. I pride my self on keeping not only my business contacts private but my friends and familys numbers aswell.
I feel my privacy is being invaded now that we share the family plan. I dont want anyone to beable to check up on me like im a child. Its insulting and its invading my privacy! How can i change the privacy of my numbers in calls and text from my phone book?