Am I a jerk for wanting to cancel our wedding?

Me and my girlfriend of 5years, was supposed to be married, next month, it was planned, but we talked about it, and we have no reason other than love, for us to marry, and I said I don't want to be married because for the last two months there haven't really been any sign of love or affection, also because I'm not 100% about the wedding, because I'm really insecure about our relationship as it has been going lately, we argue slot about everything, and we're never really as happy as we used to be.
I get that it's hurtful and stupid to cancel so close to the wedding day, and I know what an utter arse I am for doing so.
I guess what I'm asking is, am I really that big an ass for not wanting to do the wedding as the relationship feels like it's about to go to shit?
Am I a jerk for wanting to cancel our wedding?
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