Right! What I meant is that when you look at perception itself, of thoughts or anything else, you run into turtles all the way down, or up. Who or what actually thinks? I do? except I can't decide what I think entirely, even if I do, how do I know that I'm doing it.

The core of it I think is that thoughts are no more "real" than hallucinations. The major difference between thoughts and hallucinations is that thoughts correlate with something real.