I think even scientists are not sure about anything concerning antimatter. They say that there is a universe made of antimatter and there is humans made of antimatter in that universe. If antimatter and matter are present in equal in amount in our universe scientist can find only a few antimatters in our universe so they say while the big bang there is a lot of matters have been created than the antimatter and they annihilate with each other and the remaining matter is what the universe is made of! You know there is no antimatter and matter inside the hot ball of big bang!