Keg, you write some thoughtful posts but on the issue of SSM I think you can't see past your own personal beliefs.
You seek to impose that on all of society.
One group of people seek to withold a right/privilege/activity from another group, whereas the other group seeks to make the right/privilege/activity avalible to all. You can not suggest that each group are equally trying to force their beliefs on the other.
If aboriginals or women were still not allowed to vote would you suggest it unfair for them to impose their right to vote on the white male society who already could vote? No, because the white men already could vote. Nothing was being imposed on them. The right to vote was simply being extended to the rest of society.
Your marriage is NOT affected by a gay person getting married. Take Mrs Keg on holiday to Ireland or California and you will see that nothing changes in your marriage as a result of the fact that there gay people legally married walking around in those places.
My point being; There is a big difference between seeking to specifically exclude a group of people from an activity versus seeking to have all people be equally entitled to it.