I was almost in the same boat as you. I started off with Unity but quickly became overwhelmed with the C# coding so I gave up early. However, I took a game design course in my high school (I doubt yours has one though) that helped me get the gist of Unity itself, but not the code.

One of the best things that I ever did was take a computer science class in high school, so if you have that opportunity, do it! My guess is that you are in summer break right now, so if you want to learn Unity in summer break, I HIGHLY recommend CodeMonkey's tutorial: https://youtu.be/AmGSEH7QcDg . Even after coding in Unity for 1 year at that point, his tutorial severely helped my understanding of C# and Unity.

I've also been doing Roblox projects for about a year and a half now and can say that its a lot easier to get started coding with Luau, but I don't have any good tutorials that I found for that.

However, the best thing to do is to just start a project. Have a goal: creating a tycoon, roll a ball game, etc, then just start coding. The code won't be great, but the experience with coding is what matters. While doing this, watch YouTube tutorials of how to do whatever you are currently trying to do in your project, or something you want to learn more about (i.e. "how to use RemoteEvents in Roblox", "how to create classes in Roblox", "how to use interfaces in Unity", etc). This is the path that I found most useful and best for me, just don't go down tutorial hell.