Am I ready to get married?

I have been engaged for about two months and the wedding is in one month. My fiance and I have never lived in the same city and I am afraid that we might not be ready to spend everyday together. I love him and he has never done anything to hurt me but I think we may not be as compatible as I originally thought. To make matters worse, I met someone else who I really hit it off with. Nothing serious or intimate, just a wake up call to what might be out there. I know there will always be someone cuter, younger, etc. So is this cold feet, selfishness, am I a bad person? Any advice would be most appreciated.