Why is my MTB suspension fork so stiff?

First off, I have a Fuji Odessa 1.0, which is not really anything special. But I'm not sure if the fork at the front is working right, because, when I'm riding, I don't notice it doing much. I can only really get it to move if a push on it. I'm no experienced mountain biker or anything so I'm not sure if this is a valid concern, but I just need some clarification. Thanks!