I am going to catalina for a school trip, and i cant shave for a week!?

so the advisor going with us, said there are gross showers. bugs on the floor but thats not the point. we only get 5 min showers!,. how im a supposed to shave my pits and my whole leg that fast and wash my hair! and i cant wake up early and take the shower. also we are wearing swimsuits and short shorts. also the bathrooms are sooo gross, how do i get used to it cause i hate dirty things!