Hello Generalinformation
I'm sorry to hear that you have a large lump in your bowel. understandably it's a worrying time for you at the moment. 
We've some information on our website about the kind of tests that you may have in order for the Consultant to determine what's going on. Do try and keep in mind that it would be unusual for someone of your age to be diagnosed with bowel cancer. I've linked the information for you here. 

I do hope that you don't have to wait too long for a diagnosis. 
Best wishes, 
Jenn
Cancer Chat moderator