People have dreams. Some people will realise them and do amazing things. Others will fear failure and not even try. The one thing that I do know about successful people is that they had faith in themselves, even when others lost faith in them.
When you know you are here to do something great then do not let anyone else tell you that you can not. There are many people who will give advice and warn you of the risks but they are your risks to take.
Be brave. Have faith in yourself.