As @pepe.maya stated in her reply that if you don't marry, "you are immediately weird", that is the truth. It's been my experience that people marry because they are the right age, their love interest is good enough, the family expects the relationship to progress, it's time for kids... It goes on and on. Excuses to get married, not burning desires.

When you meet someone and fall for them, give it a full 18 months before making any decisions. Let the love wear off and make sure you can deal with the other person on a day in day out basis. Then you'll know your relationship is strong enough for marriage.