Hello elitexsniping, welcome to the forum!,
yes you can! You have to go to "Manage extras" and then click on "Add extra". You'll see a list where you have to select "Hidden pages". Then you have to set up your new extra.
Now you'll find a new option for all of your pages:
You can manually add new users and give each/all of them an especific private page. Remember that you are the only who can add new users to the list. If you like you could add the "Contact form" extra and your visits could send you an username/password that you could add to your users list
Hope it helps!