Antimatter. sorry if I sound like a dumbass...?

Nah we all get ideas like this sometimes. But no, a black hole would annihilate itself if it was antimatter because when any matter was pulled in and made contact with the antimatter, they would annihilate each other. A black hole is the result of the "death" of a massive star. When a star core greater than three solar masses fuses all of its hydrogen and helium thermonuclear fuel, gravity prevails the tug o' war of radiation and gravity and causes the star to collapse. Because of the great mass, and therefore great gravity, the collapsing star compresses all its matter into neutrons. As it continues to collapse, its density becomes infinite, while its radius shrinks to 0. Absolutely no volume. This infinitely dense, volume-less object is called a singularity, and it has an escape velocity greater than the speed of light, so, essentially, nothing can escape the black hole if it ventures too close. The edge of the black hole that separates it from the rest of the universe is called the event horizon, the point that the escape velocity exceeds light speed. The more mass that goes into the black hole, the larger the radius of the black hole, which is called the Schwarzchild radius.