One way to think about it is by asking yourself, "If I were just entering this situation today, would I take the job/join the project? Or would I see it as a fr

One way to think about it is by asking yourself, "If I were just entering this situation today, would I take the job/join the project? Or would I see it as a fruitless endeavor?" That can help get your mind out of thinking about what you've already sunk into the job.