I have a tiny bump in the back of my throat near the uvula is this mouth cancer ?

Internet Diagnosis: A "bump" is not necessarily cancer, but without knowing any social habit history like smoking, drinking, and use of chewing tobacco, it is impossible to tell. Have your dentist take a look.

Unlikely to be Cance: Any bump/mass requires close watch for further growth or resolution. If it grows over the next one month, then it should be checked by a medical doctor to find out the cause. Any mass of one cm or bigger requires a biopsy if it is growing in size. Oral cancer is rare in young people.

Exam: Can't tell without exam. See oral surgeon or ENT doc for assessment.