Have you talked to your parents about seeing a chiropractor? You are a little young for DDD, but I'm not saying that it's impossible. Most likely you've got a herniated disc or you injured your neck. Have you been in any car accidents? Do you workout with weights? It's easy to hurt your neck with weights if you're not doing them correctly, and the pain takes a very long time to go away.

Do you have any symptoms that go down into your hands or arms? Usually a pinched nerve will radiate to the extremities.

I'm sorry you're feeling pain. Some physiotherapy and chiropractic session may be all you need. You can do some simple stretches from a physiotherapist to find some relief, and watch your posture while on the computer and video games. If you can't see a physiotherapist you can look up the exercises online.

Good luck with your diagnosis.
Cathie