Yep. I believe. But they may be far away from us.
Also, even though there are probably millions of civilizations possible, you must also factor in TIME.
In all the worlds out there, there may have been a million planets with intelligent life out there, in the past, and there may be only 1 now, us, or a few, or still thousands.
And, I announce that I have seen a UFO, around 1967 or so, with other witnesses, when I was camping. There was no doubt about it.