It is a simple question and can be resolved beyond doubt right now. It only requires looking and honesty with yourself.
So thoughts are going on, and you know it. You can describe a past thought. So it seems that you are that which is aware of thought. Can this be said with confidence? With certainty? Can you realize that once and for all, you are something beyond thought, something to which or in which thoughts appear?
WHAT that something IS, is more thought. Thought is the only way to attempt to give that something a definition, yet we find that something, which is presently aware of thought, can't be found objectively, isn't some thing in our experience. It's the subject TO the object-thought. Is it not so?
So you can recognize right now, that what you are is that purely subjective presence which knows thought. And in the same way it knows the sensations called "body" - foot, leg, torso, chest, arms, neck, face, eyes, ears, etc. All these are sensations or perceptions - appearances or experiences - to YOU - to that presence of knowing.
So notice that you are here and open - knowing - subjective - while the world, body and thoughts are experiences. What you are isn't appearing as another experience. Can you be an experience to yourself? Can you be objective?
Very clearly, you are here yet not findable in terms of experience. In fact you are that which makes experience possible - that opening or capacity in which or through which or to which experience comes and goes. Is this not so? Is it not obvious?
So the seer isn't seen. The knower isn't known, presently, through objective experience. The subjective self is always unknown yet the most real aspect of any experience. It is like the screen upon which the play-called-world dances.
Start with the most simple discovery - you are not the mind. Notice this beyond doubt.