Several years ago I pitched an investment idea where individuals could invest small amounts into larger projects. Everyone said, NO. Now, these crowdfunding real estate sites are making billions. Its not that my idea wasn't good, or that it was "too original". I just gave up and didn't peruse what I felt would be a success, because of others doubts. I have other "idea's" I have pitched, and all shot down. The next billion dollar idea could be in your head and you are the only one who needs to believe to make it happen, or it may happen for someone else who took action.