Are You the Body or the Mind?

If i am the body, what is everything else? This is very odd to think about this. Experientially, we don't actually see any boundaries between the body and the world. So where does my body stop and wat rest of the world begin? Is it at the boundary of my skin? And then, like i finger nails, are those finger nails no longer me once i clip them off? What determines that seems rather arbitrary. Or is the mind constructing these boundaries? Because after all, there is really no difference between looking at the colors on my hand and the colors of the wall behind my hand. There's a sense of ego which didn't exist before you were born.