Nora Roberts said:
A writer never finds the time to write. A writer makes it. If you don’t have the drive, the discipline, and the desire, then you can have all the talent in the world, and you aren’t going to finish a book.
Look at your writing projects. Do you have some that are finished? Did you abandon any? What happened from the initial spark to where you finished or stopped working on it? What does this tell you about the reasons to finish or quit a project?