I have charcot marie tooth and have been experiencing low sex drive and erectile dysfunction. is this normal with cmt?

CMT: Yes your ED may be due to your CMT. There are reports that have found older people with CMT impotent.Check with your urologist or neurologist for help

See your doctor: There are many factors that can cause erectile dysfunction and low sex drive like low testosterone and depression (low sex drive) and poor blood flow from vascular disease (erectile dysfunction). since CMT causes nerve damage and an intact nervous system is required to get an erection, CMT theoretically could cause ED, but because of possible causes you see a doctor to be sure.