Your coach can see your form. You can only feel it. Let the people who can see you help you.

What a movement feels like from inside and what it looks like from outside are different sets of information, and neither one is complete. You can feel effort and balance; you cannot see your own elbow. Refusing outside eyes means working with half the data and slowly building in faults that feel fine. Being coached is not an admission of weakness, it is access to the view you do not have.

Ask somebody to watch one specific thing and report what they saw rather than what they thought. Film yourself if nobody is available. Fix the one thing they name, then check again rather than assuming it carried over.