My hair isn't at shoulder length just yet, but every time it's been that length before, I had exactly the same problem. It even happened when I was a little kid with baby-fine, totally straight hair. Last winter I had shoulder-length hair and was CO washing, which encouraged more waves. Something in your washing method could be adjusted to do that.
There are also people who have success with plopping wet hair in a t-shirt to sort of scrunch up the waves as the hair dries, but I've personally only tried that once. Still other people wrap their hair to straighten it, and I know there's at least one thread on it around here. I tried to find it for you, but the search function is acting up for me.
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