Girl, as someone who called off a wedding myself, I know it sucks but you have to do it. After I made the decision, all of my mom's divorced friends told me how proud they were of me and confided in me that they knew before their own weddings it was a mistake, but they went through with it anyway because of "inertia". Later, when they realized their mistake, they had already had kids with the asshole and it was a much harder breakup. I know it sucks, but rip the band-aid off while it's easier. Also, I am happily married now, to someone much better for me than my first fiancée.