You'll never get the original source code, because most of the details in it (such a names of variables and comment) are removed when compiling.
All you can get is the machine code in readable form.
Why not find a job in coding? Surely your employer will give you some application to work on, which might be the motivation you need.
Ok so Im learning fullstack coding from codeacademy. But my interest is waning. But I know I personally am best motivated by application. Now there happens to be a program called Masterplan Adventure Design Studio I like which has been abandoned by its developers. There is no source code for it and the website for it is gone. And its starting to get wonky.
So I thought a great learning project for me would be to learn its code, patch it up and improve it. Now I figure there must be some way to get its source code. But all my attempts (right clicking it and looking for a "source code" option) have been futile.
So how would I generally get a look at a program's code?