Is it possible for me to tell if i have colon cancer!?

No: At your young age, colon cancer is unlikely. There are little or no symptoms from colon cancer. Late colon cancer can cause bowel changes, bowel obstruction, slow blood loss anemia, etc. See your doctor for an examination to discuss your concerns.

If you have: Bleeding, or a family history, colonoscopy might be indicated. If you are just worried, a stool test can detect secret blood (guaiac), and that would be an indicator to get colonoscopy if positive. These stool tests are cheap and helpful, but endoscopy is expensive and not a casual test.