Of course there are aliens.

It's a big universe, the same thing that formed Earth & life PROOOOOOBABLY happened on another far place, unless we're the only lucky ones who got to live.

Don't believe that "ALIEN UFO CAUGHT ON TAPE !!!MUST WATCH!!!" stuff, they just filmed the sky with a potato & photoshopped a white dot onscreen or used CGI.

Aliens are far away, & depending on what time they got to live, whether their first entity of life was in the 1880's, or way back in the past, they could either have discovered us, or have no idea that we exist & are in their own version of the Stone Age.

It is hard to believe, but there is a very high chance of life on another planet, but they're just not humans.