What Should You Do?

What to do when you want to talk about yourself but you are not able to do so? What if you wish to share your fears, your shortcomings, and your insecurities but you're afraid of what your close ones will think about you? What if you fear that the image they have formed of you in their heads will shatter if you actually told them the things that go thorough your head when you're alone? What should you do then? Sometimes you desperately need someone to listen to you and even if they are there for you, you back out at the last moment because you cannot find it in yourself to talk to them. And then you become a person who may speak a lot, but doesn't talk. What should you do in such a situation?