I had the same kind of pain during 9th/10th grade. However, mine was due to not having grown big enough to support the weight of textbooks in my backpack and from natural adolescence growing pains. I'm not sure what your pain is caused by. Are you doing some sort of job or activity that requires carrying heavy equipment or backpacking? Are you doing some sort of weight lifting that trains some muscles but leaves others weak (if you are weight lifting, you should make sure you train your wrist, bicep, tricep, shoulder, chest, upper back, lower back, and legs)?

Yasir, have you tried acupuncture for your problem? I believe this could really help tyou, in absence of any clinical findings.

Have you tried neck manipulation treatment? According to newest studies it is the most efficient way to get rid of pains.

Naprapathic Manual Therapy or Evidence-Based Care for Back and Neck Pain; A Randomized, Controlled Trial, Eva Skillgate, Eva Vingard, Lars Alfredsson Clinical Journal of Pain, May 2007, 23:431-439
"Naprapathy works better on back and neck trouble than recommended and proven effective advice from doctors, according to a new study from Swedish medical university Karolinska Institutet. "

Manual Therapy, Physical Therapy, or Continued Care by a General Practitioner for Patients with Neck Pain. A Randomized, Controlled Trial, Jan Lucas Hoving, PT, PhD; et. all.
"Conclusion: In daily practice, manual therapy is a favorable treatment option for patients with neck pain compared with physical therapy or continued care by a general practitioner."

Manual Therapy Best Alternative Treatment for Neck Pain Relief
Ann Intern Med. 2002;136(10):713-722, 758-759
"After completion of treatment, success rates were 68.3% for manual therapy, 50.8% for physical therapy, and 35.9% for continued care."

Korthals-de Bos IB, Hoving JL, van Tulder MW, Rutten-van Molken MP, Ader HJ, de Vet HC, Koes BW, Vondeling H, Bouter LM. Cost effectiveness of physiotherapy, manual therapy, and general practitioner care for neck pain: economic evaluation alongside a randomised controlled trial. BMJ. 2003 Apr 26; 326(7395):911.
"manual therapy is faster and less expensive in relieving neck pain than more traditional types of therapy."

And many others can be found...