It all depends on what perspective you view things from.

For you, you reality ends ½" from your outstretched finger.
There is no one else in your reality. There is no one who can affect your reality.

The interaction mechanisms are really fascinating. The thing that makes us think we are interacting with others. The things set up so that you can shoot someone else, or be shot, and that you "die"

The reality is you, everything else is an interaction mechanism we call a universe.

And yes, there are people who have been shot, and nothing happened to them.

There is no space-time.
Time exists as a set of still frames.
And the still frames are created each 10 trillionth of a second.

The continuousness of your life, what you call the future and the past are kept in place by you. Not because there is a universe and space and time that you are subservient to.

And yes, all of Modern Materialistic Science is against this.
T.H.E.Y. spent a lot of time and effort setting up Einstein and making you believe in "space-time". Fortunately, that belief structure is falling apart. That "science" is being disproven.

You are not an insignificant speck of goo. God knows you by name. And you are an integral part of this universe. Every being is important, like every puzzle piece is needed to complete the picture.