Joint pain in knee, ankle, waist, wrist.

I am just 23. I have joint pain on my both ( shoulder, elbow, wrist, waist, knee, ankle) and back since 1 and half year. I told this problem to orthopedic doctor and rheumatologist and they told me for few blood test and urine test like ra factor, cbc, uric acid,crp and others but all test was normal axcept the uric acid it was around 10.after medication it became normal but my joints were still hurting and orthopedic doctor send me to the Rheumatologists he was also told me for many blood test and this time every test is normal and uric acid too but calcium is little bit low and I completed the medication but my joints were still hurting.I forgot to tell you I was gyming around 3 years before joints pain started, and I don't smoke,I Never take alcohol,beer and any steroids pills or powder. Please give me proper suggestion in details. thank you.