Summersover, I am firmly in the belief that marriage should be done solely for the purpose of wanting to be together in a committed, monogamous relationship for the rest of your lives because your both madly in love with each other. It should never be for convenience, or to "feel safe". That's just a recipe for disaster. Besides that, you're so young still. If you don't want to get married, then don't. You're not being fair to yourself, or your fiancé.