Hemorrhoids Black Spot

Is this hemorrhoids or colon cancer?
I got on and off in my stool black and now I had some red spots some of them. I also clip buttocks where it feels like a cramp in the butt region. I'm not losing weight if I seem can not put more than two pounds on, then fall back to where I started. The red went away for a day and returns today although I have eaten a cheeseburger. So what do you think it is? I hope I don `t die. I am 23 and skinny. Also my penis is small most of the time and I mean real small, but once awakened it goes to medium and large, this could be part of the problem as well? This is not black for most of its brown with some black dots.
I would not expect to see a doctor
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