Doubts

Am i the body?
Sometimes it seems so obvious that i am that. But i cannot really find the I without reference to the body or to past memories, or desires. I can make out memories and desires are illusions, products of the mind.
But what about the body?
Sometimes i call the body 'me', sometimes i call it 'mine', when i feel pain somewhere, i say "there is pain in my body". How can i make out which sensation is my body's and which one is not? Is the body a set of sensations i prefer against another set of sensations which i want to exclude? Why would i want to exclude these? There is little consistence in what the standards of the mind present. But i am confused about what it is too.

Perhaps to know what is the body i should know what is the non-body? What is the non-body and am i that or not? That which can be felt effortlessly, without touch of hands or skin, is what i call the non-body. But again it is not consistent with the theory: what i cannot feel ever and which is part of the body, eg. the brain, bones etc. And what is that which i can feel at times and cannot feel at other times? Sometimes if feel the heart-beat, sometimes i don't. What is the heart the body and non-body at other times? This is not sensible.

The word body is very much doubtful, and yet there is a strong sense of it as opposed to that which is not the body.

I keep doubting.