Thinking negatively is often due to a narrow perspective. Just by widening your perspective and focusing on positive aspects of a situation, you can change negative thoughts to positive thoughts!
Consider Suzie. She hates putting utensils away once the dishwasher finishes its clean cycle. Every day she is annoyed as she sorts the knives, forks, and spoons into their slots in the silverware drawer. One day she decides she doesn’t like feeling annoyed. She widens her perspective to one of gratitude for the hands that enable her to complete this task. Unlike her aunt who is debilitated with arthritis, Suzie recognizes she has dexterity in her fingers. Now, when she sorts the silverware she does so with a spirit of gratitude for the flexibility in her hands.
Whether you don’t like doing household chores, writing that monthly report, or doing any other number of tasks, thinking positively can simply be a matter of shifting where you place your attention.