I'm 22 with minor anal leaking is that a common sign of colon cancer?

First, there is. Underwear staining versus losing control of your bowels without realizing it. This is not usual cancer sign. You need an exam for sphincter tone and perianal sensation.
Uncommon. Thats an uncommon sign for colon cancer. Colon cancer is a very slow growing tumor with very few symptoms. We still need to explain your symptoms. I recommend a visit to your doctor.