>>1188770>manletNo you aren't. 170cm is within 1 standard deviation of the average US height. It's right on the bulge of the bell curve. I wouldn't start calling someone short or tall until they are 2 standard deviations from the mean.
>110 poundsThis is really light, though. That's 50kg. You probably look quite skinny, but most good cyclists do. If you're all muscle, then that's great for cycling. Honestly, there's nothing wrong with your body. You should be riding with your saddle just high enough so that your legs are only slight bent at the bottom of your downstroke.