The greatest thing in the world is to know how to belong to oneself. – Michel de Montaigne
I came upon this cute cartoon that describes what goes on in your head when a lot of us are doing yoga asanas(poses). The practitioner is in the Warrior 2 stance, a favorite of mine.
Giving a lot of direction and reminders is what yoga teachers do so you are not thinking all these thoughts and are in the moment, otherwise you start to wander or worry about everyone else or get into ego mind, letting your eyes travel and inspecting, comparing and judging other people on their mats. By walking you through every movement, what it is doing for you and reminding you to breathe; you can stay on your own mat, in the “now” moment and remain in alignment.