Are you for or against gay marriage?

I'm a 22yr old Atheist. And to be honest, I'm kind of against all marriage. I don't think I've ever met a truly happy married couple. If you want to spend your life with someone, go ahead. I guess the only benefit I see to marriage if the tax brackets. And those are supposed to be made available to any couple who stays together for a certain amount of time, regardless of marriage status.