The goal is to become more comfortable with your body. So do whatever you need to do to get there. If that means eating better, and exercising then do so. If that means masturbating more frequently, then do so. If that means walking around naked, exposing more skin, then so be it. It’s okay to be a little selfish even if it might offend someone. Taking back your freedom of expression is par for the course.
Other conditions might be contributing to your low sexual desire. These may be emotions such as anger, resentment, depression, or things like stress and worry. It may be due to something in the relationship. This is not a disorder but is more likely just an ebb and flow of your sexuality, which is natural in the end, and speaking with a psychotherapist who specializes in sex therapy, or a sex therapist may be the impetus to overcoming it. If it’s a more organic problem such as certain medications or illness you will need to seek the help of a medical doctor.