We're one small region of a larger existence that includes similar, and possibly different, universes like our own. Like a pocket universe that's bubbled off an original universe. There's only finite ways particles can be arranged in space and time. So theoretically, if spacetime goes forever, it's got to start repeating at some point. That means if you were able to search forward or back enough, you'll probably find another version of you. Or infinite versions of you.
Which is probably easier to swallow with an iced mocha. Let's go get some.