There is life other planets.

Lee, Dongseong ( as known as Scott )

"The universe is a pretty big place. It's a bigger than anything...
anyone has ever dreamed of before. So if it's just us it seems like
an awful waste of space." ( Contact, 1997 )

This idea is exact same as mine. The Earth where we've lived is pretty small compared to the universe. Nobody in the Earth has traveled even out of the solar system.
Who can conclude that there's nobody except us in the universe?
We've just never met life from other planets.

Maybe they would've already been here and observed our life for studying. Or they would've tried to contact with us and it might need more time because the universe is a pretty big place.
One thing I've worried is they might be aggressive to us. What can we do, if they have high technology and want to attack us. We may be attacked like SF movies.

Anyway one obvious thing is the universe is a big and there're so many palces we've never visited. So I believe there's life other planets even if I've never met them.
It's just us it seems like an awful waste of space.