I was only 15 when I made my first game ever, and let me tell you, it was a mess!
It took me like 3 months and was only 30 minutes long, but the reason I finished it was because I had a TON of fun with development!
So in my opinion, when youre a younger teenager, the real trick to game development is simply finding something you can understand and that you enjoy doing. My first game wasn't in any game engine, it was actually in Javascript alone. So you should really try out a bunch of different ways of making games until you find something you enjoy doing! Here are some fun ones I would recommend for a beginner programmer/developer:
- -Scratch ( no coding, just block programming!)
- -Pygame (basic python, which is an easier language to learn)
- -LOVE2d (This is with lua, which is one of the simplest and most fun languages to work in!)
- -Godot (this is a simpler game engine that uses a game like python, which is also quite fun!)
Also, if you ever want personal help in any of these, I'm (mostly) well versed and would love to help :)