Unlikely. Just consider that we're made up of the most common elements, and you'll see how it's not just possible, but likely that we're sharing this galaxy (and the universe) with other life forms

I saw some idiot comment that because aliens on other planets are not in the Bible, then they don't exist.

Japan isn't in the bible either.

Morons.

I have no problem with the notion that we are probably not alone in this galaxy, and more certainly in the universe. However, it is a little like seeing something odd in the sky that does not lend itself to explanation and coming to the conclusion that it is a vehicle being operated by an extraterrestrial intelligence. That's just the wrong way to do things. It should remain an Unidentified Flying Object until sufficient evidence is available to make a reasonable and supportable guess.

[phys.org]

We are probably not, but what kind of other life forms are there?

Unless we can find some seriously radical method of extremely high-speed travel, we may as well be. It is laughable that so many people think we are visited by aliens constantly, when the distances are absolutely staggering. A signal from Voyager 1, traveling at the speed of light, takes 17 hours one way to reach Earth. That's 17 light-hours, not even close to one light year. Even if we are able to contact another civilization, the time it would take messages to get back and forth and the time it would take to make sense of them would be far to long to make much difference. Yet people actually worry about the possibility of alien invasions. Your chances of being hit by lightning are astronomically higher.

For practical purposes, yes we are alone. Strictly speaking, it's a big place out there, therefore likely there are other planets with life in them but the distance between us is beyong mind boggling.

A purely hypothetical question.