Showering everyday is not really necessary unless you get really dirty and sweaty and then need to shower off to clean up.
Sometimes I'll shower everyday and then sometimes I'll go a day without showering if I'm not all that dirty because showering everyday can actually dry out your skin and do more harm than good.
But sometimes like during the summer months I get so sweaty that I cannot go without showering everyday but during the colder months sometimes I'll go a day without showering.
As long as you're not really dirty or smelling then it's perfectly fine to skip a shower and not shower everyday.