You meet dozens of people who tell you you can't do it. Surround yourself with the people who believe you will do it. Seek out and spend time with those rare people who tell you, no BS, why you haven't done it yet, what it takes to do it, and how they could help you do it. Note how this advice works whether 'it' is robbing a bank, opening a gallery, or writing a bestseller. "It" is up to you. But you can't do it alone.