It seems you have experienced what nearly every man on these sites have experienced at one time or another (no reply). It seems the accepted norm by both sexes that it is easier to ignore any initial contact by someone they are not interested in than trying to tactfully say they are not interested. As for the appearence of being desperate, I wouldn't sweat it. We are all on here hoping to meet somebody. Making the first move, rather than hoping somebody else will, can be the difference between being successful and wondering why you remain single.