You shouldn't be. There is a wide variation of body proportions amongst the riders. All that matters is that you can get as aero as you require, and that the resulting positions provide the best power transfer. Some pros use a shorter drop because they prefer to reach further, which still gets their backs nice and low. Some like a heck of a lot of drop because they have long arms and/or don't like to bend their elbows as much. There are many reasons for each rider's specific fit, and more is not necessarily better.