Being conscious is embodiment in its own right: you decide to think a thought and you see your thought being thought.
The fallacy of composition is an informal fallacy that arises when one infers that something is true of the whole (all forms and manifestations of thinking) from the fact that it is true of some part (your single example) of the whole.
Also: the truth value of your theory is subject to your theory itself.
It’s explicitly referring to the opposite of a “brain in a jar” scenario.