Because you are not settling for the crap they put up with just so they can show off their ring to the other ditzy 20yr olds. You are more mature, and educated enough to know that marriage is difficult and you must be discerning and choose someone who is WAY smarter than those doofus college dudes they are marrying ( and will probably be divorcing within 5 years and have to start all over again). Don't sweat it - your man will come along...