I have no appetite lately but im feeling fine im 22 with no weight loss or fever im worried about cancer?

Unlikely: Cancer is unlikely with your age and lack of symptoms. Talk to your doctor about your concerns.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated.