Start with small exercises to change habits to train your will muscle. As a right-handed person, you can e.g. do certain things with your left hand, or straighten the way you sit several times a day.
Positive thinking makes life easier, but the key to success is discipline. Fortunately, one can practice discipline by training one's willpower.
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I have earned wages as a waitress, a nanny, a librarian, a personnel officer, an agricultural laborer, an advertising secretary, a typesetter, a proofreader, a mental-health-care provider, a substitute teacher, and a book reviewer. In and around the edges of all those jobs I have written poems, stories, and books, books, books.