Depends on the preferences. As a guy, I'm always a little intimidated by the thought of dating a taller girl. But recently...I've thought... "I wouldn't mind dating a taller girl..."
Though if you ARE a tall girl and think that you're relatively good looking, you should try more of the 'gentle soul' approach when trying to date a shorter guy. Try not to let it bother you, just have a cute personality...tallness with a 'withdrawn/shy' type of personality is a GREAT combination.
As a tall person, some people might think that you have an instinctive intimidating air around you which provides psychological protection. However, you're a girl so try a more "I'm kind of shy" and gentle approach. Guys LOVE shy girls. : ) It kind of invokes a certain male instinct to 'protect' the shy girl. He'll be overloaded by how cute you are, that he won't care that you're taller than him. : )
Girls are at their cutest when they have trouble expressing their emotions. : )
Least...that's my opinion...!