You can hide me or introduce me to a few. But if you show me the world, I will leave you. What am I?

Answer: A secret

More What am I ? with answers

More What am I ?

You can hold me, fill me, but you can't pour me. I am needed to live but can be broken. What am I?
You can see me in water, but I never get wet. What am I?
You can see nothing else when you look in my face, I will look you in the eye and I will never lie. What am I?
You can slice and dice me, peel and chop me, cut me, cook me and I might make you cry. What am I?
You can swallow me, but I can swallow you. What am I?
You can throw me away, but I will always be coming back. What am I?
You cannot keep me until you have given me. What am I?
You carry me everywhere, even at night and I can also be a flashlight. What am I?
You do not want me when you don’t have me, but when you have me you don’t want to lose me.
You get embarrassed when you stand on me when everybody is watching. Women don’t like to talk about the number they see on me. Everyone stands on me when nobody is around. What am I?
You heard me before, and then again. Afterward I die, until you call me again. What am I?
You hold my tail while I fish for you. What am I?