It is not possible to know if life does or does not exist in the universe, because the vast vast majority of stars are not visible to us. Stars are organized into galaxies, and every galaxy except the few closest ones appear as just a small dot of fuzzy light on a photographic plate. It is not possible to resolve individual stars, let alone planets. Even most of the stars in our own galaxy are invisible due to dust clouds in space. Hence it is not possible to ever answer the question of whether there is life elsewhere in the universe.
What we can do though is check if there is any detectable life in space. Well we have been checking for decades and found nothing. So what we can say for sure, based on hard evidence, is that there is no detectable life in the universe.
We are alone. It would be wise to get used to this information, rather than going into denial, like so many people do.
But fortunately, if you are interested in life, you are on a planet with millions of species of life. All are proven to exist and are easily visible. Keep the telescope for looking at the moon. If you are interested in life, the microscope is your friend.