We aren't. 🙂
Oh, and FORGET all the "fine-tuned" bullshit: there are infinite number of Universes at the Multiverse and some of them, just happened to have Life (of this kind or another). No "divine intention" and no "cosmic plan", just pure chance.
We're important to OURSELVES, but NOT to any "grand plan" out there anywhere, because there is no such "grand plan" in existence. 🙂