Remember, the word thought is not synonymous with the word truth. Your thoughts are not necessarily true or important and you don't have to take them so seriously. Think of them like passing clouds in the sky -- they come and they go. Your true self is the ever-present observer who watches your fear-based thoughts as they pass by.
Each person requires a different form of communication, a deliverance of speech tailored to their own needs. You can't chat with your mom as you do with your partner, and you cannot talk to your boss the way you speak with your best friend. Knowing how to be a verbal chameleon results in truly effective speech.