Please do as shown bellow to private your account.
1.STEP ONE:
Go to Settings then to Security and change the settings to the following :

NOTE: KEEP IN MIND THAT YOU WILL BE CHANGING THE ''Who can contact me?'' SECTION TO ''friends of friends'' ONCE ADDED BY AN ADMIN! THIS IS A MUST.
ALSO GO TO ''Limit Past Posts'' AND PRESS THE ''Limit Old Posts''  IF USING A RECYCLED ACCOUNT.

2. STEP TWO:
Go to your friends list and do as shown bellow:

3.STEP THREE:
Make sure to set your profile picture to friends as well as all the information in the ''About'' section. 
NOTE: this does not apply to the phone number email and hometown if you wish to keep it at ''Only me''