There is no way that we are "alone" in a universe estimated to have practically infinite planets.
However, the distances between stars and the very short windows of time in which life may thrive (remember that we may have never known about the dinosaurs on our very own planet if we didn't discover their bones, and we will never see them again) means that we may never meet any other life.
However, the distances between stars and the very short windows of time in which life may thrive (remember that we may have never known about the dinosaurs on our very own planet if we didn't discover their bones, and we will never see them again) means that we may never meet any other life.