So many solar systems out there, life evolved in many planets for sure. No proof but no doubt.
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If we become a space-faring civilization, how long will it take us to colonize the galaxy, such that there are few places you can go and not find evidence of humans around? Not more than a million years or so.
So if intelligent life -- capable of becoming a space-faring civilization -- is common, why is the galaxy not colonized already?
Kursgesagt has a good video on this: https://www.youtube.com/watch?v=UjtOGPJ0URM
Sure, it's easy to imagine someone doing it a million years faster than us. But at the same time it's very likely we are just early to the party.