I believe in the possibility that there may be other life in the universe other than ourselves, since we managed to exist, somehow. However, I have
yet to be shown any convincing proof that there is any life elsewhere.
And since we don't have the foggiest notion how a lot of chemicals can magically form into a living thing, it's difficult to state with certainty
how rare or common that process might be. It would seem from just a cursory observation, though, that if life is common throughout the universe,
we'd have a lot more evidence of it. So that would seem to suggest that life is not particularly common. It doesn't apparently sprout up on every
chunk of rock floating around in space.
The bottom line, I suppose, is obvious. Until we find proof of life elsewhere, then we don't know if there is any.