Analyze your body type.
Each person do have different body type. I for instance, do have sort of like an hourglass body type. There are several difference of body type in this fashion world as per in the picture below.
Try on your favorite skirt at home or in stores and look at the hem length of the skirt. The hem is the bottom edge of the skirt. Not all people looks good in a short skirt or even long skirt. Choose the right hem length that could flattered you.
(Picture by arlenataylor.com)
Just be happy with your own skirt choice. At the end of the day, it is your body and your own comfortable. Do wear what you feel is right and look nice on you! .