So, let's suppose that there's no entity behind our thoughts, choosing them, no entity behind our actions, it's all happening by itself (by an infinity universal force that is common to everything, that infinity intelligence would be the real you, the same for every body or being or appearance). So "you" don't exist, your body and mind is just an spontaneous and effortless expression of this universal intelligence. Even the sensation of being someone controlling and choosing the thoughts, controlling the actions is happening by itself, also an expression of this infinity common intelligence. Until someone or some event, like this post, allert you to this possibility and you are open to it and decide to check it out.
How we can verify if we really exist as an separate entity that is in control or not? Notice that, in this scenario, even the verification of such fact will be happening by itself.
Another good question would be, if it is really the case, it will be possible to prove it to other being that are still dreaming in the illusion of being in control? If yes, how?