Hello. I wrote a short story. Does anybody know any websites where professionals can check your writing, rate it and tell you your mistakes?

You might try Finestories.com or lulu.com

Ask your question here (on the Forum or during Wednesday's chat):

The Writer's Chatroom - Writers helping Writers (http://writerschatroom.sallyfranklinchristie.com/wp/)

We have traditionally published and self-publisher authors as members plus several beta-readers.