I do believe that there is life at least somewhere else in the Universe, though not anywhere near Earth, or at least not evolved to the point of space travel. Planets and moons in our galaxy have been shown to be capable of harboring life, such as Europa, Gliese 581c, and maybe even Mars, but the life in our immediate vicinity would be primitive, maybe even microscopic. Life elsewhere we have no information about, but even if it had space travel, even at the speed of light it would take a long time to get here.
Therefore, I don't believe in UFOs as aliens.