The first thing to remember is that your symptoms could be anything. So don't rush to conclusions. Also, as others have said, we are not doctors. We can't diagnose you.
However, you need to get scoped. I was 30 when diagnosed and had symptoms for a good 6 months or so before finally getting a scope - which revealed a stage 3c tumor in my rectum. I was given all the typical answers from various doctors, e.g., hemorrhoids, a fissure, lack of fiber in my diet, lactose intolerance, etc. They all dismissed cancer due to my age. I had to insist, to the point of begging, to get a colonoscopy.
So if you are really this concerned - to the point where you are posting on a message board intended to provide support for people who already have been diagnosed colorectal cancer and their loved ones, then you need to get a scope. Insist on it. If your current docs won't order one, find one that will.