>>719915086
Personally, I'm of belief "you" consists of a few intersecting things:
>Your neural network, where your neurons communicate via electrical and chemical signals
>The DNA in your neurons. Mutations in DNA occur all the time and end up contributing to what you do and think. The "seed" of the RNG you might call "you"
>The chemical & electrical signals between your neurons. If you could pause the universe, "you", the signals your neurons make, make a distinct pattern too, an indistinguishable part of you.
They all directly interact with each other. A signal here might cause the DNA in the receiving neuron to mutate slightly, it sending a wholly different signal suddenly. The effect of this will ripple through your matter. But what if another signal reached that neuron first? What if the DNA hadn't mutated?
All of those micro-processes end up causing "behaviour". I'd say thinking we are our behaviour is a fine and practical thought. But in the end, I think it's the 3 pillars I described I think is "you".

If someone manages to copy all of those perfectly, they'd still fail to copy "you", since those neurons exist somewhere in physical space. In a space that is different than where "you" are. With how everything in this universe sings, the copy of you would experience different things, however minute.
Imagine holding an icecream cone, and someone makes a perfect copy of it, which promptly gets dropped onto the floor. They are the same icecream cone, yet one is in your hand, and the other is on the floor. They are "the same", yet they are clearly not.