See, you've got that backwards too. Yours is the argument from incredulity. "I can't understand it, so it can't be so". Mine is the explanation from the physics of the universe.
It's all well described by the math, but since you can't understand the math, you can't accept it.
Be specific. What doesn't make sense to you? That the repulsive force of expansion is tremendously weak? That gravity gets stronger as the distance gets shorter, to the point where it becomes irresistible? That nothing, including light can escape from a black hole, and that's why it's called a black hole?
This is all stuff that's covered in basic college level physics. You should learn some.