You just have to keep posting. I'm currently doing contests things for my story on here. keep talking to people , read their stuff and leave a comment and maybe they will read your stuff.
You can't expect a hundred new comments in a day. It all takes time. You'll have to wait and advertise your story around a bit. And most comments that take 40 seconds are useless anyways. Go on Forums and ask for a review or something.
Don't worry. I felt the same way at first when I joined. I was so used to people reading my stuff on Quizilla that I got annoyed when no one read my stuff on here. You have to just keep posting and keep trying. It's hard to get readers on here. At least it is for me, because everything I write is original fiction.