Im 22 and sometimes i see fresh bright blood on top of stool how likely is it colon cancer?

Not likely: At your age it would be very unusual to be colon cancer. If the blood is bright red and on the tip or the end of the stool or on the paper it is likely to be hemorrhoids. I wouldn't worry too much. You can use hemorrhoid cream and make sure the stools are soft and that should resolve.

Very unlikely: It is very unlikely that this is colorectal cancer. You should see your doctor and get examined with a rectal exam and discuss a colonoscopy with your doctor. This is especially true if you have a family history of crc.