Interworld by Neil Gaiman & Michael Reaves

Joey Harker isn't a hero. In fact, he's the kind of guy who gets lost in his own house. But then one day, Joey gets really lost. He walks straight out of his world and into another dimension. Joey's walk between the worlds makes him prey to two terrible forces—armies of magic and science who will do anything to harness his power to travel between dimensions.

Reuploaded Thanks to badaboom