As
@Ghost said, no. It would be extremely difficult to build an MMORPG.
You'd first, need to have experience with developing Video Games. But to gain experience with making Video Games, you'd need to know a couple of Programming-Languages. The popular Languages for Game-Development are C++(
Unreal Engine, Godot and a lot of Proprietary Game-Engines), C#(
Unity3D, Godot[I think] and MonoGame API) and Java(
JMonkey and
LWJGL API). Those are the popular Languages in today's world of Game-Development.
Next, when you've learned a couple of Languages. You need to start making Games. Start off simple. Either pick-up a Game-Engine like Unity3D or create a Text-Adventure Game. Or hell, maybe create a Game using an API such as OpenGL(
C or C++) or LWJGL(
Java). In Unity or Unreal, you'd be restricted to their APIs, not to mention that they'd have limited Functionality and restricted Server-Sizes. But if you had your own Game, built from scratch with it's own Graphics-Engine, own Sound-Engine, own Components etc. then you'd have a lot more free-reign with what you can do.
But, when you've got the experience with developing Video Games with a pre-existing Game-Engine or from scratch, you now need to know how to do things such as Networking, having Players connect to Servers and how to synchronize Gameplay and Player-Movement all at once. Mind you, this won't be easy and it won't be cheap either. Servers can rack-up Costs pretty fast, but that depends on how much people are playing, the amount of Code being executed at Runtime and what's being sent to the Server and back to the Players.
As
@Ghost also said, ThinMatrix is a YouTuber who creates Video Games. His first Project was an MMORPG which got pretty far into Development. But he ended up scrapping it as it never reached the KickStarter Goal that the Funds from it would be used for Server-Costs for the Game, personal-stuff, Equipment for Development etc. Later on, he began a new Game and that made it out to release and has garnered good Reviews. Both the MMORPG and his new Game were written in Java. He has also made some Videos teaching LWJGL, so if you know Java or plan to learn it then check them out when you know the Language.
But, please do not take on a Project as big as an MMORPG on your own. It will be extremely difficult and it won't make it very far unless you create simple Game-Models and Sounds, know what you're doing and are good with the Language it's being built in. You could, of course, make it a Text-Adventure MMO as you would only have to write Code and not do anything else such as Sound-Effects and Models, but even then, you still have to deal with Networking. Which isn't easy.