I don't want children, and I don't believe in the institution of marriage, but I hope and expect to meet someone and stay with them for some years.
Also I encourage you to think about if your children may not be ideal, given your family history, could they not still be above the average? If so, they could still help to move the world towards higher genetic integrity on the average, a step in the right direction, no?
As for your situation, I hear what you're saying but I'm not too clear on what aspect exactly you're seeking advice on, could you elaborate?