What you are is being engaged in a situation, an ongoing process in time, of responding to ever changing givens. That is what it feels like, and since every situation is a nesting of situations within each other, you could say that, for example, driving a car is a typical cross-section of the ongoing complete and multidimensional situation - a largely unconscious going-on in which you are nonetheless entirely and fractally present. Reflecting on it is representing to yourself a complex and inescapable engagement which elicits and strains your attention. It has parts which are causally interlocked so that a movement of thought evokes a branching of associations which produce a wash of feelings which again prompt reactions in thought and all so that a self-sustaining feedback loop is maintained. The whole process is so complex and rickety that left to itself it would soon wind down if it were not continually fed with an energetic concern in which you can dimly make out a certain highly charged core, a taut reactive spring which is what you take to be your 'self'. All in all this is something like an immersive cinema and what you ought to more than suspect by now is that it is no more and possibly no less than the witnessing of it, since again and again you have known it to turn on a dime. The whole scenario likely to change in a flash, with no lost momentum and no lingering after-effects, all of it weighing precisely nothing. The very insistence of the 'self' - the same sort of big idea that everybody is always speaking about in their own behalf - only another kind of appearance.