What is problem in my programming journey??

Hello everyone...First of all i'll tell u that i am studying .net MVC and I need some suggestions from u...My problem is that, i can write web applications like Blogging website, Movie website, Students managment system,Forum  and websites like this(In one word Crud Applications).But i cant understand why i cant write  chat application, mp3 downloader application and applications which dont need crud.Also i cant use librarys. I dont know how to use their members. I need suggestions pleasee i am so confused...