I'm feeling a little confused now, I've been told that every story uses the hero's journey and now you're telling me that not every story is a hero's journey.
Not every story is a hero's journey. You can try an fit everything in that mould, but IMHO, a lot of times its stuffing a square peg in a round hole. You can do it but it can be messy and it takes a lot of twisting.
There are lots of different ways to classify story types. Some say there is only one story, others thirty six, and it goes on. Link to descriptions of different plots. Frequently Asked Reference Questions I read a screen writing book where the guy says there are ten basic stories. They're all right and they're all wrong. Part of writing theory is about l organizing your thoughts, knowing what basic elements go into a story and knowing that if you're missing an element that the story may not be complete. But which theory you follow is up to you. There are commonalities between different theories as well as differences. Find what works for you.
A couple of books I recommend you check out are "20 Master Plots" and "Save the Cat". These books describe how they classify different plots. The first book obviously shows you 20 plots and the second shows you 10.
Can you tell me exactly what the hero's journey is? Is it a template used for all stories or just certain kinds of stories? Are there other templates that you could name?
Here's the wikipedia entry for what a Hero's Journey is. Monomyth - Wikipedia, the free encyclopedia
Here are a few movies that follow the Hero's Journey.
Star Wars
Lord of the Rings trilogy.
Eragon
The Matrix
Tron Legacy
Wizard of Oz
The Goonies
Star Trek - the new movie series
Avatar
Also I'm feeling all, on one hand I want to be original and break away from the traditional hero's journey, on the other I am terrified that if I do it won't sell.
Don't fret about originality. Originality isn't necessarily about the basic plot, but about your approach to telling that basic plot. For example here are three vastly different movies that share a similar plot and elements, Friday the 13th, Alien, Jaws. They each have a monster, they each take place in isolation or perceived isolation, they all contain elements of greed, and it goes on.
Also think about the classic Romeo and Juliet. How many times has that type of story been told? Westside Story, Lion King 2, Romeo Must Die.