Is there any way to make InDesign to focus only on its own Fonts (C:\Program Files\Adobe\Adobe InDesign CC 2015 (32-bit)\Fonts) folder and not others like C:\Windows\Fonts in windows and /Users/<username>/Library/Fonts/ in mac?
I think this will help me to use only licensed fonts and not the system and free fonts antecedently which are installed in default system fonts folder for other applications.
That's what font management software is intended for. Check out the various font management software options for your computer platform. They let you load exactly the fonts you need for your projects. It's easy to open and close set of fonts. And many more font related features.