How did I get athlete's foot?

Be sure it is . Be sure you have athlete's foot (tinea pedis). Many conditions can look like it but are something else, like dyshidrotic eczema, contact dermatitis or bacterial infection. If you're uncertain, have your doctor examine you for proper diagnosis.
Fungus. Is found in shoes, standing water, gyms.
Infection. Came into contact with the fungus the causes it.
Fungus. Fungus is everywhere-some people are more susceptible.