Genetic testing

Ever since I was a teenager it has been my intention to have genetic testing done prior to conceiving. As someone who has a debilitating genetic disease which took multiple expensive operations at a very young age in order to live a normal life, it has always been my intention to make sure my children are as healthy as possible. I'm not talking about playing God and picking the genetics of my child to have a certain hair color height etc. but just ensuring that I am fully aware of the possibility of genetic issues prior to actually having the child. I informed my sister of this (she was not a carrier) and she thinks I'm crazy. Am I crazy? Am I the only one who thinks this way?