Im have a hearing lose in my right ear.Please Help!!?

I think I was born like that cuz I'm deaf from my right hear but I have excellent hearing from my left ear.my parent are cousins so is that the reason i am like that and I'm the oldest child but My other two siblings don't have any kinds of disabilities.and I will neverr marry my cousin cuz that just soo "ewww" lolz but if I marry someone will my child be hald deaf? Cuz I would never want the same for my kids :(