Why does imagining heart light trigger self-judgment and sadness?

When the guide asks me to imagine light flowing into my heart, I feel immediate resistance and a sudden, heavy sense of self-judgment. The visualization feels impossible and sometimes triggers sadness. My name is Sameer, and my Date of Birth is 14th June 1985. Time: 4:15 PM. Location: Mumbai. I suspect this is linked to my ongoing depression and deep feelings of unworthiness.