I have never been able to see in 3D, I was born with both eyes turned in (they call it a squint or strabismus) so I had an operation to fix it that didn't work. So I had more operations. They never fixed it properly in the end. So I have always had to wear glasses or contacts (although my eyesight is too bad for contacts now) and my eyes don't work together which is a real pain.
I am lucky that I have both eyes, though, losing one in an accident would be awful.