Listen to what Sara said. You need to find a diagnosis. Everything she said makes perfect sense.
Hi Senior: I'm really sorry you are in pain. The first thing you must do is to tell your parents or guardians. A trip to your doctor is definitely in order for this. At the least, you need an X Ray.
As for why your wrist is hurting, well, there could be a number of reasons. Carpal Tunnel comes to mind. If you're on your computer as much as my 17 yr old is, that could be part of it. You can try some ice on your wrist and staying away from the computer for a while. And yes, I know it is your life line.
Bottom line: Tell your parents and give your wrist a rest for a while. Please let us know how you're doing. We're not doctors, but pain patients. Many of us are parents.
And we do have some smart people here. But you need a doctor for diagnosis and treatment.
Keep us updated on how you're doing.