Yes, that is how the pubertal development going to be. It generally follows a developmental sequence as explained in the following link: http://www.mgh.harvard.edu/children/adolescenthealth/articles/aa_puberty.aspx
In the development sequence the pubic hair comes first and arm pit hair and voice changes take place later.
If you Google for ' Puberty in Boys ' and read the section under Puberty in Wikipedia, you will get more details.
Normally, the puberty in boys start during 11 years to 14 years and mostly completes by 16 to 18 years. Facial hairs and body hairs continue to develop for many years after Puberty.
Sorry to learn that you have pain in nipples and it should go away after puberty.However if you feel more pain, I advise you to see a doctor.Do not feel shy of discussing such problems with your parents, your health comes first.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.