You need to stop worrying,at your age there is more chance of a lottery win than it being cancer. It's highly likely to be piles or another non serious condition. 

Hi,

I am also 19 and suffer really bad health anxiety too. Sometimes I spend hours sitting up at night convincing myself I have terminal cancer and don't have long left to live. I've learned that when you are looking for symptoms, you tend to notice them much more. I thought I'd reply as a year ago I started getting the same problem you describe, only on the paper, not inside the bowl. I convinced myself I had bowel/colon/stomach cancer and that's all I could think about at the time. It really affected my day to day life, I was searching statistics about bowel cancer in teens and even though it's extremely rare, I really thought I was about to be diagnosed. Fast forward to a year later and it turned out to be a fissure which I initially ruled out as I thought I would of noticed it. You say you have also ruled this out because you have had it three months, I have now had problems for a year due to this. My advice would be to see a Dr to put your mind at rest. Once I was told mine wasn't cancer, a massive weight was lifted off my shoulders. So try not worry too much. ( Forgot to say I was also told pink/red blood tends to be fissure/ hemorhoid and dark/brown blood would indicate something else wrong)