Dodging or Beating Around the Bush

Why can't I be straight with people.  I seem to always beat around the bush.  Why can't I just come out and say what I'm thinking.   With one of my friends I am able to talk about a bunch of stuff, but there are some topics I just dance around.  Why can't I just spit it out.  Why do I hide and dodge?  This is almost as bad as saying "I'm Sorry" all the time.