You should always ask yourself if a particular application needs an RDBMS. Too many applications are built with a design process that automatically assumes all the required tools and frameworks at the beginning. Relational databases are so common and many developers have worked on similar applications as before, that they're automatically included before the project starts. Many projects can get away with this, so don't judge too harshly.
You started your project without one, and it works. It was easier for you to get this up and running without waiting until you SQL. There is nothing wrong with that.
As this project expands and the requirements become more complicated, some things are going to become difficult to build. Until you research and test alternate methods, how do you know which is better? You can ask on ProgrammersProgrammers and weed through the flames and 'it depends' to answer this question. Once you learn it, you can consider how many lines of code you're willing to write in your language to handle some of the benefits of a database. At some point, you're reinventing the wheel.
Easy is often relative. There are some frameworks that can build a web page and connect a form to a database table without requiring the user to write any code. I guess if you struggle with the mouse, this could be a problem. Everyone knows, this isn't scalable or flexible because god forbid you've tightly coupled everything to the GUI. A non-programmer just built a prototype; lots of YAGNI to be found here.
If you'd rather learn an ORM manipulated by your language of choice instead of learning SQL, go for it, but try to install, create a table and pull some data out of a popular database with SQL (Select * From ; isn't mindblowing stuff). It's easy to do. That's why someone created them in the first place. It doesn't seem like such a huge investment in order to make an informed decision. You could probably do a performance test as well.