It’s ok, starting out it’s all so alien we all tend to get frustrated, until we practice and practice and it all begins to click and then it becomes second nature. Modeling has some strict rules you have to follow, meshes behave in ways that later become easily predictable, you just have to hang in there until you get the hang of it. Trust me, you’ll get the hang of it and then it becomes addicting and cool.
Have you watched the Blender basics yet? Or the Fundamentals of mesh modeling?