Be careful with YouTube videos! There is a lot of information on the internet and singing is something that different people experiment and feel different things when doing the same thing. Some people could say they feel like A when doing retraction, and other people can say A is not correct, they feel B. And there is a lot of misinformation specially on "how to sing high notes", "how to become a tenor", etc (clickbait videos).
Your vocal range is not the most important thing you need to focus on. You need to be able to understand all different techniques, practice them and be aware of everything that is happening on your throat. That way you can choose how to approach each note and listen to other people and how they do that, to learn from them.
In this process, your vocal range will probably extend, if your voice is untrained, and that's when you can worry about reaching a note or the other, because you will have the technique to know if you can reach it or not.