I have a pain in my groin or what feels like the back of my right testical im not 100% sure were it is but could it be my prostate or prostate cancer?

Not likely. The prostate is located deep in the pelvis, below the bladder and in front of the rectum. Prostate cancers rarely cause pain. You are 23 years old, so it is much more likely to be either a musculoskeletal strain (groin area) or testicular inflammation (many causes.) http://www.Nlm.Nih.Gov/medlineplus/ency/article/003160.Htm.
Not likely. Your age( 23) make it very unlikely to be a prostate problem or a prostate cancer , men usually start having prostate problems when they reach aroung 40, but testicular problems can occur at younger age , to be sure, you should see your doctor;a pain or a bulge at your groin area can be an hernia.
Not prostate cancer. You are too young to have prostate cancer. For the rest please see your doctor as a physical examination is needed to provide an opinion.