He makes me go to school and shower. IT SUCKS!
He's really doing it for your own good. Think about it: School is where there are GIRLS. Having showers makes you more attractive to GIRLS.
Your dad wants you to be popular with the girls.... those are just a couple of ways to get there. Right, Nvr?? 
(Since you're just 13, I'm guessing that when your dad sees this, he'll soften up a bit on those expectations. Reverse psychology works every time!) 
Should I get my 13 yr old daughter on here too??
She's really cute, if I do say so myself. 