Swimming ARRGH

Today i had swimming squad. I am about to collapse right now because recently i did 49.5 freaking laps (1.2375 KM) i was SO annoyed with my squad teacher i CALULATED the distance i swam. 1 KILOMETER!!! tell me is that relevant?? While my friends are out shopping i have to STAY and SWIM. In the shower i felt like dying. I was so exhausted i couldnt be bothered to WASH my hair properly as i did like 100 freestyle laps that day and my arms were killing me. I had youth later on and i am sooo tired now:/