"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great." Mark Twain
There are people around all of us who inspire us, those to encourage us to live our dreams. And then there are those who keep reminding you on all the reasons why its not save, not doable, why you should not follow your paths. These are the people you should stay away from, because they consume your positive energy.
That said, I am not talking about the good advice of your friends, when they look at things from a different angle, when they want to protect you. Its possible to outline the obstacles but still encourage to overcome it. Thats the difference between a dreamer and one who is aware of the risk to fail, but wants it sooo bad, to take the risk and overcome it. Good friends, who inspire you, are open with you about the consequences any decision might have, but they don't impose on you to go only the save way or to do it their way. They help you figure out, what you truly desire, and help you achieving it. When you fail, they don't drag you deeper by "I warned you!" So? Whats the point of this?
Inspiring people, with positive energy might say "We know, this could happen. But its on you to rise again!"
Surround yourself by people supporting you to live your dreams.