Are we all really this self-centered??

I really can't handle it when I hear someone talking about being engaged to someone they are not in love with. How many people in the world actually marry people they want to be with ALL THE TIME? I freaks me out that it probably isn't that many. And I guess it works out? But then, it really doesn't because over HALF of all marriages end in divorce. Are we all that self-centered? Are we so misinformed on what love is that we all THINK we know what it is and then settle for somthing that isn't? AHHHHHH!!!!! I'm going to be single forever. My standards are altogether too high, apparently.