I am fairly certain in my belief that life exists elsewhere in the universe. I would even go so far as to say I am confidant that intelligent life with brainpower similar to that of humans. It is unfortunate though that I feel we will never find it. There are around ~200,000,000,000 stars in our galaxy. Not all of them have solar systems like ours, but a large number have planets in the habitable zone (the sweet spot distance from the sun where you can have liquid and solid water) and statistically very probable that at least a few have a molten core and a bunch of carbon. This means that there is a fairly decent chance that life, even in a single cellular form, exists somewhere within our own galaxy! Then you must realize that there are another 200,000,000,000 galaxies in our universe (some estimates are much higher) so even if only one out of every 200,000,000,000 stars have life on it, there are that many galaxies, all with life (even if only on one planet).
Our own sun is about 2/3rds of the way out on our arm, and the diameter of the milky way galaxy is 100,000 light years. Even if we were lucky and there is life in our own galaxy, at about the same position but on the other side. The fastest man made object traveled 150,000 mph, and assuming we could make this speed safe for humans it would still take 4 billion years to make it to our suns position on the other side of the galaxy. Even if we broke physics and went the speed of light it would take over 60,000 years. And this is only if we are lucky and life exists elsewhere in our own galaxy.
For these reasons I feel confident that life exists on planets other than earth, and that we will sadly never come across it. As Carl Sagan thought; If we are alone in the universe, what a tremendous waste of space. Thoughts? Criticisms? What do you guys think?