In the United States, "My Head & My Heart" debuted at number 82 on the
Billboard Hot 100 chart dated February 20, 2021, eventually peaking at number 45 on the chart dated March 13, 2021. The song was
certified platinum by the
Recording Industry Association of America (RIAA) on June 1, 2022, for sales of 1,000,000 certified units in the United States. It also reached number 13 on the
Mainstream Top 40 chart dated March 20, 2021. In Canada, "My Head & My Heart" debuted at number 88 on the
Canadian Hot 100 chart dated March 27, 2021, and peaked at number 21. It received a double platinum certification on April 8, 2022, for sales of 160,000 equivalent-units in the country. In the United Kingdom, the song debuted at number 98 on the
UK Singles Chart dated January 14, 2021. It peaked at number 18 on the chart dated March 26, 2021, and was certified platinum by the
British Phonographic Industry (BPI) on July 15, 2022, for sales of 600,000 equivalent-units. On the Australian
ARIA Singles Chart, "My Head & My Heart" peaked at number 21 on the chart dated March 8, 2021, and received a platinum certification from the
Australian Recording Industry Association (ARIA) for selling over 70,000 equivalent-units in the country. ==Music video==