"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke
That is an absolutely true say. It is terrifying if only the human race is in the entire universe, and also terrifying that we are not alone in the entire universe.
I don't think we are alone, even here on earth, things like the kingdom beneath the water, the Bermuda triangular, area 51 etc. All thses are terrifying, and are in planet earth, not knowing what are out there in space.
We are not alone.