Don't know much about this, but I know it took some very specific things to allow, and then create, life on earth.
I do believe there is most likely life somewhere out there, elsewhere, in the universe. So many galaxies and solar systems... circumstances must be appropriate on one of them somewhere to have propogated life. But the chances of developing life are very small I believe, and most likely did not occur in any given solar system. WE have one planet for sure in ours that has life... 1 out of 9 (8? no pluto?) planets. That's already probably wayyyy disproportionate to the chances.
Do I believe there is life out there? Yes. Do I believe it is intelligent? Probably, somewhere, you have alien animals of some sort. Do I believe it is as mentally advanced, or moreso, than we are? Probably not. And I am pretty dang sure if they are, they don't know about us. We may very well never find life anywhere out there.