If we assume life is "common" in the universe and we aren't just the sole miracle that slipped through, would it be possible that we as humans are also the "common" life form? A carbon based, bipedal organism? If we're not the only source of life in this massive universe, why would we be the only "human type" so to say? I understand that the other lifeforms would be different in many aspects, but since carbon is one of the most abundant elements in the universe, would it be reasonable to assume that other lifeforms would be possibly slightly more similar to us than portrayed in books/movies?

Sorry for wall of text and formatting. I'm on mobile. Also I hate to use the word 'assume' because the universe is one big ball of crazy and I know it's difficult to safely assume anything, but I couldn't think of a better term to use.