You cannot be a rational subject without veto-control on the level of mental action.

Whoever loses the capability for inner silence, loses contact to himself and soon won't be able to think clearly any more.

As far as inner action is concerned, we are only rarely truly self-determined persons, for the major part of our conscious mental activity rather is an automatic, unintentional form of behavior on the subpersonal level.

Subjectivity is an ability, the capacity to use a new inner mode of presenting the fact that you currently know something to yourself.

You cannot be a rational subject without veto-control on the level of mental action.

A lot of evidence shows that most of our cognitive processing is unconscious - phenomenal experience is just a very small slice or partition of a much larger space in which mental processing takes place.

I believe that if we would carefully apply the distinction between transparency and opacity to the different layers of the human self-model, looking at self-consciousness in a much more careful and fine-grained manner, then we might also arrive at a new answer to your original question: What a "first-person perspective" really is.