Why visualizing lighter body threaten identity shell discomfort?

The moment I shut my eyes and imagine myself feeling lighter and healthier, I can feel a pang of discomfort. Not doubt, but a physical feeling, a tightness in my stomach that shouts out that this is not you. This new image seems to threaten my very identity, and that my present body is some sort of protective shell that I am not prepared to remove. It is more draining than any diet and I am left wondering whether my own mind is my greatest barrier to change. The meditation that is intended to strengthen, rather, expresses a latent war. Who am I without this weight? The threat of the reply is so overwhelming, that it closes the visualization even before it starts to be created, and I find myself in a body that my mind appears to insist upon possessing. Name: Anika Sharma DOB: 12th August 1991 Time: 7:15 AM Location: Pune