Brief Answer:
It looks like acase of Generalized lymphadenopathy
Detailed Answer:
Hello,
Welcome to Healthcare Magic,
I have gone through your history and understand your concern
1.Lymph nodes can be palpable when there is a underlying infection.
2.It will be sore touch.
3.In younger age group the lymph nodes can be palpable, which will be of no significance if its size is less than 1 cms.
4.This seems to look like a case of generalized lymphadenopathy, which can be due to any underlying infections like 
Cytomegalovirus (CMV),Epstein–Barr virus (EBV),
Infectious mononucleosis, HIV and other conditions like lymphoma, leukemia, Systemic 
lupus erythematosus (SLE) and 
sarcoidosis.
5.I would suggest you to undergo laboratory investigations like
   Complete Blood Count- To rule out Lymphoma and leukemia
   Chest X ray- To rule out Sarcoidosis
   HIV Testing- HIV ELISA
   Monopsot Test- To rule out Infectious mononucleosis
   Antinuclear 
Antibodies - To rule out SLE
   Antibodies for EBV and CMV
These investigations helps to find out the aforementioned causes for your condition (Generalized lymphadenopathy).
Hope I have cleared your query, if you have any further query feel free to post them.
Thank you.