Sounds like you have the TalkBack function activated. Use two fingers to open/slide in menus. To choose Settings for example, tap once to mark then double tap to enter the settings menu.
When the screen is locked, use two fingers to open the phone. Tap once on the program icon, then double tap to access it. Do the same thing for Settings. In Settings > Use two fingers to scroll down to Accessibility, tap and then double tap > Do the same for TalkBack and the same thing when turning it OFF.
