Do you think there are people in other planets?

Was that a space pun?
Also, to answer your question yes, I do believe in alien life forms

Not On other planets but existing in multi dimensions, sure.
Space to us is a physical measurement limited to our understanding of 3 spatial and one time dimension.

Either we are alone in the universe, or we are not. Both are equally terrifying.

I think there might be other life out there, but I think the possibility of us encountering them is very very slim.

Obviously. But not humans or "people" unless you're defining them as intelligent life, then yes

I personally don't think there is other sentient life out there. That's just my opinion though.