My baby corn snake wont eat?

First I want to say, pet stores are idiots usually. If they are recommending bugs and fish for a cornsnake that is just ridiculous. Corns eat rodents. Are you trying live or f/t? Make sure your temps are right in the cage. You can leave a live pinky in the cage with the snake overnight. This might work for you, and live pinkies don't pose any danger to the snake. Also give the snake a break between feeding attempts - if you do it over and over again the snake gets stressed and won't eat. It is recommended to wait a week between each time. Good luck.