How does gay marriage harm you, and what makes it your right to tell two consented adults who not to marry?

The issue is not what gay marriage does to ME and my marriage. You can live with a donkey for all I care. But when you want to codify your relationship under the laws of the country, that's where I have a problem. The United States has a definition of "marriage." Once a word no longer has a meaning, then the doors are opened towards all sorts of other interpretations... not just yours.