The people around you are YOU.
A dude on here just said to me "Not everyone can write a book" Guy has over 30K tweets averaging 100 odd characters per tweet. He has already wrote several books. But loser friends around him have put down so much. He has no self belief left 
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I suggest he cuts off his loser, nagging bitch ‘mates’ then. What is your advice if family is being negative, or dragging you down?
Family is always tougher. You have to set boundaries and be more subtle about it, in most cases. Regardless. Don't let anybody poison you no matter what. Just keep your focus on the task at hand.