Well, to be honest, if you haven't had a broken heart or haven't broken a heart....you are either really young OR you are living in a very guarded place either figuratively or literally.
Those of us that truly live, that feel, that are - we have had our hearts broken, we have broken hearts and we've also probably stomped a heart or two in the dirt because it was just necessary to continue life.
If you heart has never been damaged, just wait, it will be if you are allowing people to get close to you. And if you are afraid to have your heart hurt, stop being afraid. It WILL get hurt, but you know what - the right person will come along and it will be healed and that will be the best experience you will ever have.