I think your horse is lovely and you ride her so quietly and sympathetically. Thank you for sharing your lesson - such clear and constructive advice with a sense of humour thrown in. Priceless!
I was horse mad as a child but no access to a horse! I had a go at riding aged 40 2 falls including concussion and that was me finished! I’m currently in pain from a slipped disc but oh I do enjoy watching your lessons. The comments are priceless. I’m actually laughing through the agony
The reason you are falling out in circles and getting a shoulder in effect is because your position is shoulder in. On circles and turns, you need to lead with your inside hip and shoulder, not the outside.