We are not alone.
Some say humans were a hybrid group of primitive hominids infused with alien DNA bred to work for a more civilized beings.
The vast cosmos has worlds just like ours populated with human or human-like of all sizes and colors from micro=sized to macro-sized in various stages of development. Some are still in the stone ages and some have advanced to the point they are part of the galactic federation. They may look exactly like us but left handed is dominate, some may have multiple limbs,multiple mouths, noses, etc. but still have human DNA that is comparable and compatible with ours.
There are draconian reptilians, shaggies, insectoids, avian, and aquatic beings throughout the cosmos. Some are agreeable(friendly peaceful) some are disagreeable(war-faring, non empathetic, and straight up predatory) .
There are beings that exist without a physical body they are made of light and gaseous ether forms.