I second that Aila! Everyone has ab muscles--the way to actually see them is to lose the body fat, and the most effective way to do that is diet.
I've posted this many times in the past, but it never hurts to reinforce--abs should be trained like any other muscle. This means you don't have to do 400 crunches 5 days a week. You should train your abs once or twice a week, and do it with weights. Also, you really only need 3-4 sets of 10-15 reps. The old "if you build your abs you get larger" line is a myth. You have to build the muscle to get that six pack.