Speak for yourself.
You don't get a lot.
The question is simple.
How could you possibly doubt that what you are experiencing is what you are experiencing?
If you think that is too complex a question that is too bad.
You seem to lack the most basic empathy that would tell you the way you express your views isn't good enough.
No. I have a lot of empathy for people with cognitive dissonance due to a lack of the ability to think. But that is meaningless.
When you have an experience where it appears you are giving a command, you know the experience itself
You know beyond doubt it is what you are experiencing.
You know beyond doubt the experience of the arm will not move as desired without giving the command.
The command is there before the experience of the arm moves as desired, every time.
but you don't know whether you are indeed giving a command
If the experience of the arm does not move without giving the command you only have experiential evidence that it is the command.
You have no way to doubt it is the command.
It may well be your brain doing it
There is no evidence of that.
And it conflicts with experience. The experience is of doing something not of having something done.
Your brain is doing everything you are experiencing
The brain is somehow creating all the mind experiences and it also creates the autonomous active contemplative mind.
The brain is reflexive and unless damaged it will reflexively move the arm every time the mind commands.
These attributions of every feature of the mind to the brain is just intellectual laziness and absurdity.