Question about birth and how we made it here

[FortunaMaximus]

Within yourself, then, or from others.

We are what we are because we are. Sounds simplistic, but that's just it, I think.

Slight changes in little things, ripples across time. Sure, anything is possible.

The many-worlds interpretation allows you to be all different things you could possibly be in all those universes, if they sprout from a common timeline.

Whether this is the case or not, that we wonder about these things should make them at least in the realm of possible.

As to the out of the body experience part. Well, it'd be reasonable to think all the manifestations of you, including yourself, share a similar consciousness. Whether there is a Ur-consciousness from which all these different ones emerge is probably a different question.