itt: KILL IT!!!111. Seriously, even if the OP chopped the snake it'd be fast enough to bite him, possibly poisining him.
OP, were you able to see the colors of the snake? If so please describe them so we can identify the snake. Also, go tell your parents. They might be able to call some sort of animal control to handle the problem because Animal control is far more experienced than you.
If you do call Animal Control and they catch the snake, make sure there are no snakes in there. Then look for any possible hole that the snake used to get into the room.