Consider this, next time you feel alone, separate from others and from life:
The only element present in significant quantities when the universe began was hydrogen, the lightest and simplest of all. Every other atom ever produced was forged in the fury of a star or supernova. Which means every atom in you.
You, and everybody and everything you know, are quite literally stardust. When you understand this, how separate from anything and anyone can you ever really be?