The truth of your instincts is the root of your foundation.
Don't be an actor. Be a human being who works off what exists under imaginary circumstances.
The foundation of acting is the reality of doing.
Transfer the point of concentration to some object outside of yourself - another person, a puzzle, a broken plate that you are gluing.
Acting is the ability to live truthfully under the given imaginary circumstances
Acting is behaving truthfully under imaginary circumstances.