Colan cancer?

I've been sick for a while first puking blood then a lot of blood in my stool when I had an endoscopy the didn't find much but I had a colanoscopy and they didn't find a hemriod nor a pollup and not chrones or anything they found a weird lump on my anal and weird jelly bubbles all over my intestines the dr is afraid to take a sample of the lump but I continue to bleed and get weaker and more Exsaughsted like I want to sleep all the time and I can't walk or function normally and I have unexplainable weight loss to the extreme and shortness of breath but the hard part is I'm only 14???? Help