uh I hate to tell you, but young women experience hair loss, just as anyone does. Your crown looks bald cause you're losing hair, like the 44 yr old women who replied. How do I know? I lost hair, I have alopecia. So get used to it.
Maybe the cow-lick isn't spreading, the skin is--they actually have spray in hair for that: http://www.onlyhairloss.com/glh/
Try going on top for a while
Could you go for a less sleek style perhaps, keep the pixie cut but wear it tousled or mussed up rather than combed sleek? With a good matte hair gel you could muss it up over the cowlick? I have one right at the front and it drives me nuts, i'd love a fringe (bangs) but the maintenance would drive me mental!