It could be so many things.  Colitis.  Chrohns.  Ibs.  But I would still keep pushing them and get a diagnosis don't automatically think the worse though .  At your age it is extremely unlikely.  I have had blood in my poo for over 25 years which are due to piles.  But you still need to be diagnosed don't take no for an answer.  

Thankyou, I know it could be so many things this lump in my tummy has me really concerned and the blood in my stool has no other symptoms other than it's there so I know it's not piles I'm just stressing as so many of my symptoms are pointing towards it, I will keep pushing calling my gp tomorrow I just really hope it isn't cancer 

Diverticulitis . Can cause lumps and bleeding in your stool.  They form pouches of inflammation in your tummy and cause bleeding in your stools.  Call your dr tomorrow tel him how worried you are. The lump and the bleeding. And make sure he listens to you.  Purely for your peace of mind.  But if it's diverticulitis or chrons then it needs treating anyway.  

Yeah that's a really good point Thankyou for your help I will do that, I know the chances of it being cancer are low but never impossible, hopefully I get an answer soon 

Hi lovely
I saw this and wanted to reply as we've had a similar experience. I Ended up in hospital with suspected appendicitis after a trip to the GP with what I thought was a UTI, then sent home again. All my bloods, urine tests and ultrasound were clear.
 

I've got pain in my right side, blood and pain when I poo so I went back to the GP - please chat to them and they can do some more tests. My GP was good and ordered a few more blood tests the hospital didn't cover (vitamin D and coeliac) but said it's likely inflammation or even a fissure. Im just waiting on results of a stool test and then will go from there. 

There's lot of things it could be so please speak to your GP about your worries. Hope you managed to speak to them as I realised it's been a few weeks!