Keep away from people who try to belittle your ambitions. Small people always do that, but the great make you feel that you, to, can become great.
-Mark Twain
It's important for you as the dreamer to believe in what it is you're dreaming. Others that you encounter and express your dreams with, need to know you're serious about what you're talking about. Especially if your dream requires help or financial assistance (investors) from others. Why would someone invest their money or their time in helping you if they sense that you're doubting what it is you're hoping convince them to become involved in.