How to practice ignoring identification with the body?

Namo Buddhaya. I strongly identify with body. I see myself in the mirror and I immediately recognize that that is me. Such a identification is against Dhamma. How can I disidentify with my body? Along what lines of thinking should I prove to myself that the person in mirror is not me or mine? Note:- Dhamma means teachings of Anatta. Question is related to practice of Dhamma.