It's crazy to believe we're alone in the universe and haven't already been discovered by more advanced societies - waaaaay more advanced.

Its not crazy, its called the rare earth hypothesis, and its gaining momentum as the leading candidate for the prospects of life in the universe due to recent discoveries and analysis of exoplanets. Planets are common. Planets in the habitable zone are rare, planets in a habitable zone for billions of years that also possess other conditions and elements we know are necessary for life as we know it are far rarer still, and the distances between the few we've found are immense. This explains the fermi paradox and many other things. Intelligent life might exist in the universe, but the odds of it existing in our galaxy are probably small, that is how much the odds are stacked against it. I saw a recent ted talk and round table discussion by astrobiologists, astonomers and physicists discussing speculation that the observable universe probably has a handful of intelligent civilizations at the moment based on these factors, and that its more possible than people believe that we are literally the ONLY ONE, although still probably not likely.

Heres an interesting and related link. https://www.livescience.com/origin-of-life-rna-universe-model.html