How to limit/restrict access to apps ?

Hi, I would like to know if there are means, on iPhone (iPad), to restrict, limit or deny access to certain apps (if not all) other than the main password. I am not talking about those apps that allow hiding files (pictures, contacts, videos, ... ) like secure folders and others. For example, you request to use my phone to make a call. I unlock it and allow you to go ahead. How could I make sure, you won't be able to read my mails, read my messages (iMessages), see who I am talking to on FaceTime, ... Please, help me on that one!!!!