Yes, your genetics can make you more prone to stuttering, but that doesn't mean that you cant overcome stuttering and that you will have to stutter for the rest of your life. I used to think that its just genetic and that my brain is different and that you cant cure it. And ofc it made me depressed and suicidal.  But I overcame it though deep research and discipline and now im stutter free. I know almost everything about stuttering and if anyone needs help i will be happy to help you.