I think we are the only life forms in the universe. If there were space traveling galactic civilizations, we would have noticed by now.
unless they were in a different galaxy lol
in fact even if they were in ours we would be unlikely to know. we have enough trouble as it is making out planets from far away distances, space ships would be much smaller. and if there really were very advanced civilizations roaming the galaxy, I'm sure they'd usually try to avoid contact with any other races that aren't beyond a certain point of development
I don't necessarily believe there is such a civilization out there right now, though. we could conceivably be the only living things in our galaxy at the moment. but so much time has passed, and there's so much time ahead of us, that I'm pretty confident there has been or will be other life, even if they don't reach the point of interstellar travel. and I'd be willing to believe there is, now, other life somewhere else in the universe. there are too many galaxies for me to think that's unreasonable. but chances are we will never know anything specific about the interior of other galaxies