It will definitely "feel" different but it will not be uncomfortable at all, and once you get used to not having the kilt touch your rib cage you won't even notice it

My philosophy is decide where you want the bottom of the kilt to be and measure up from there to determine the length of your kilt. Some would say pick the position for the top of the kilt first and measure down but mens fashion has been so different from kilts that men have no idea what is a comfortable height for their kilt compared to a low riding baggy pair of pants.

I know the look I want so prefer the bottom edge to be within 1" of the top of, but not below, the knee so I measure up from there to whatever height allows me to bend comfortably with a belt on.