Well, in my thoughts, teleportation can exists in 2 ways.
1st, like you guys mentioned up there. you scan your body's molecule structure, make a copy out of it, break it into molecule form and transport to another place and reconstruct everything.

This method may actually worked but it contained some risks that you may get trapped, biologically imperfect after the reconstructing and other reasons which you guys can actually imagine of.

As for my concept, perhaps there is a dimension which is in parallel timeline with us. We kinda access through the dimension which will shorten the distance between the entrance and the exit of the dimension.
Just like some movies where those spaceships can access through the universe in a dimension providing enough speed.

Well, its just my 2cents. Hope anyone who understand my concept will help me to elaborate more about the science behind it. And of course i would love to see teleportation is actually possible before i passed away.

Cheers.