We don't know if we exist. We have no evidence to prove that we exist, nor that we don't exist. We can't disprove someone from believing that we live in the Matrix, because we have no evidence to prove that we don't.
Being born doesn't mean that you come to realization. It means that you come to a 'world' that we don't even know that it exists, just to die and then get to the reality. You can't even prove that birth is real. Maybe birth is just to deceive you to believe that you exist. Everything is deceiving you to believe reality is real.