husband doesnt want to havs kids! Advice please.

So My husband is 25 yrs old and I am 21. before we got married i have always been up front telling him i want a family, Dogs, cat and babies.

Recently I told him in about 4-6Years i'm going to be ready to have kids and he told me he doesnt want to. I Was kinda shock, mad and disappointed

that gif explains how badly i wanted to hit his head against the ground. Anyways His reason are because his mother has PKU. She cant digest protein and he is a carrier and he is afriad is we have a daughter she will suffer it also. honestly i dont know. i did my research but i dont see it as a problem. I even told him about a sperm donor and other ways, but he seems not interested. I just dont want to live life travelling and Having money, a mortage and pets. I want kids to pass down my heritage to guide them to know what is to be a mom. I want to be a mom. sooo. any advice???.