One of the most important things to learn about programming is not to make things from scratch unless you have a very good reason to, imo. Programmers build off of the things that other programmers make, for example using some code library to achieve a specific task or building a game on top of one of the many solid engines that are out there. (Godot, Unity, Unreal, etc.)

Writing software is hard, and making a fun and functioning game is even harder, so unless you have some very specific reason to write a game “from scratch”, I would just get something like Godot or Unreal and start learning the ins and outs of game development and design.

Why Godot and Unreal over Unity? Because having source code access means that, if you at some point want to learn more about game engine development specifically, you can start by browsing and hacking away at the source code of an existing engine. So, do yourself a big favor and just start learning how to make games using an existing engine.