There's only one way to test your theory and that course of action is a no go.

On one level or another we are all immortal. If you can follow Pookyl's belief system there is a piece of you that always continues. If you don't believe in that, science says we are forever entangled with this world Quantumly. Either way, a piece of you always remains.

If your belief is that you maintain your current body forever, perhaps look at your history. Has your body aged over time?

I do not believe I have all of the answers of how life works. All I know is we can spend it processing theories with limited means of finding answers, or we can live in the moment and use the time we have to the fullest. It is a choice of focus and what value it brings.

Stopping a train of thought like this can be difficult. It often requires repeated attempts to seed new beliefs, but it can absolutely be done.