“While being skeptical can be a healthy way to avoid getting taken advantage of, being pessimistic - that is, always assuming the worst - can have major negative consequences on your life. Seeing only the negative aspects of any situation can cause you to miss opportunities, neglect problems that need to be solved, and fail to take action that would otherwise improve your relationships and quality of life. If you’ve always had a pessimistic worldview, it can be difficult to shift your focus, but it is possible to start seeing the glass as half full.”

WikiHow Article