Re: small bowel polyp
At your age, it's very unlikely to be a serious problem. However, you should get the polyp taken out, just to be sure that the polyp doesn't turn into something dangerous later on, since some types of polyps can turn into cancer eventually.
That's the great thing about the scopes: When the doctor finds polyps, he can take them out. When they're taken out, they can never become cancer.
So, get it removed, but don't worry.