It is a fact that, on average, girls prefer taller guys. They would rather look around a room and spot out a tall guy over a short one.
BUT
Personality outweighs everything. A girl will be far more interested in someone who is charming and funny rather than an underwear model with the personality of a wooden spoon.
The downside is you have to actually get to a point where you can show your personality. Confidence is key. If you believe you're at a disadvantage, it'll show through.