You must back yourself into a corner - eliminating all that is not obviously true. Discarding all that is imaginary or assumption.
Entertain the impossible - the illogical. Don't let anything be taken for granted.
Try to find yourself as another "thing" - see where you stop and start. Find out what is your shape or size.
Start with the only thing you know with absolute certainty - you exist. Existence is certain. You are here. No one can convince you that you are not here. You have always been here, no matter the circumstance, no matter the situation, no matter the quality of experience - your presence has been the constant factor.
So what is that presence? How do you know you exist? Is it because you see a body? Is it because thoughts are there? No - it is because you KNOW. Because you are aware. Awareness is the proof of your existence or presence.
And the body and thoughts are objects of this awareness, are they not? The body does not know you - thoughts do not know you. You know the body and thoughts. So it is a peculiar arrangement. You are there, however you aren't anything perceivable or conceivable. You aren't anything knowable. Yet you know you are here.
Isn't this strange? To know you ARE, yet not to be able to find yourself, know yourself? So we spend decades trying everything we can to find ourselves. It's quite a funny situation we are in.
The answer is that you will never find yourself in these terms, in terms of objectivity. As some "thing". AS some "thing " you would be absolutely limited, separate. Your concept of bondage would be true, because AS a thing you are absolutely limited by all that you are not. You are not a chair, not a dog, not a planet, not a cheeseburger.
But you cannot find yourself AS a thing anyway, because you AREN'T a thing. So instead of spending another twenty years looking for yourself AS a thing, just notice that your presence isn't determined by thing-ness. It isn't determined by objective attributes. You are here. Your presence is certain.
But because it isn't objective, because that presence doesn't come with attributes like some "thing", the mind tries to place it somewhere - upon some "thing" - this is the nature of identification. So this experience called "body-mind" is used - that presence is, right now, being placed upon something objective, falsely, because there is no other place to put it. Where can you put silence, stillness, no-thing-ness, presence-awareness?
The fact is that you are simply here, always. Your presence will never become something - you will never find yourself as some particular experience. You are simply here, without being some "thing" in particular. Stay with that presence but don't try to objectify it. Notice how the mind constantly tries to objectify it, and always fails.
Just be as you are - just BE - Stop trying to make yourself into something you are not. And once that unknowable presence is noticed as what you are, then notice that even these so-called "things" or "experiences" are not really split from what you are - they are not actually something different, something other, something opposite.
In reality there is only YOU.