Negative feedback is difficult to swallow, but you can develop mental enzymes that help you break it down it into something nourishing and powerful.
Often, negative information is toxic and you're best to spit it out. But if it comes from someone you trust and you recognize a kernel of truth, you may want to internalize it.
Practice turning negative feedback into positive, definite, repeatable actions.
When I feel challenged, I rise to the occasion.
If you find yourself thinking, "I hate doing this," maybe that really means "I'm not as good at this yet as I think I should be, and that's frustrating."
Or if you think, "This task sucks," try, "I have questions about how to do this task."
You aren't substituting one feeling from another. These alternative statements aren't different feelings at all. They're just more detailed descriptions.
You can't always change your feelings, but you can understand them and contain them.
Whether you're plotting a world mechadroid takeover or just trying to do better on your next test, there's one thing you need to do every day:
http://www.testmaven.net/the-power-student/the-key-habit-of-power-students
Resolve to stop making resolutions. Make habits instead.