You may find comfort in knowing you are not the only single person in the world. As a matter of fact, with the marriage age going up each year, there are more single people than ever! So, when you hear your friends and family screaming "What are you waiting for?” you shouldn't worry. The likely reason they are harping about the issue of marriage is because they are married and want you to be like them. Sure, they may say they only want you to be happy, but there is no reason an adult can't be happy being single as well.
Remember that the most important thing is to make sure you wait for the person who you really want to spend the rest of your life with. You should wait until you are ready to get married as well. Even if are in a relationship and think he or she may be "the one”, you should wait until you both are comfortable with being married.
When your friends and family ask why you are waiting so long to get married, remind them of the current divorce rate in the world. Tell them that unlike the negative statistics, you want to be sure you are giving your future marriage the best chance to last. By waiting until you are fully prepared, you cannot guarantee your marriage will last forever, but you can be doing your part to be sure you are starting with the best intentions.