Social pressure aside, plenty of young men and women are afraid to settle down with one person because they think they may be passing up a bigger, better deal in the future. For women, this resistance to commitment has made many wait too long and play Russian Roulette with their fertility window. One in five American women over 40 do not get to become mothers, and that statistic has risen by 80 percent in the last decade. If you have a perfectly good enough mate, making the commitment before it’s too late is a jump you may have to take. Remember that you are planning your marriage, not just your wedding. Marriage is not about tasting cakes and wedding dress shopping. Make sure you take a good look at yourself, your partner and the future that you both plan to share together.