Either the universe is teeming with life whether it be carbon-based or silicon-based, or based from something we don’t quite understand yet… OR we are completely alone in the vast cosmos. Both are equally terrifying.
As noted in one of the above posts, the probability of life as we know it (Earth) is a very improbable outcome, yet it happened. So if we apply this logic to the rest of the cosmos using our model of life, then it may be that life is extremely rare, or we truly are alone, but the probability of life is more than likely based on different parameters than we have here on Earth, thus increasing the probability of life elsewhere in the galaxy and broader universe. Keep in mind, were not only talking about distances here, which are unimaginably vast, but we also have to take into consideration the 4th dimension of time (t) - which is measured in billions of years in the cosmos. So, in theory, life could have sprung up at one physical place in the universe (x,y,z), but also could have occured at various times in history, and in the future (t).
Stephen Hawking put it best, I believe - He said that life is simply what matter does given the right conditions and time. The fact that we exist here on Earth and can recognize we are living in the cosmos - that everything is literally perfect for us to be here and alive (moon, distance from sun, liquid water, etc etc.) is precisely why we are here!
tl/dr - you have to abandon reason to believe that we are the only matter that has coalesced into life in the entire cosmos. It is simply too large, has been around for too long, and there are too many combinations and permutations for it to not happen.
Now, the fun part is imagining what these beings or life elsewhere would look like to us. We need to get to Mars and find ancient life and see if their DNA matches ours, or its something else entirely different.
We also need to get under the ice on Europa and Enceladus to see what’s swimming.