Thank you for the query.
First of all you need to know that any cancer at your age is a rare disease and you should not think about it. Only few percent of whole population has such disease.
nodes are disseminated all over in the human body. It gets enlarged due to regional or general infection like throat inflammation
(the most common). Around the airways entrance (mouth) there is a lot of such lymph nodes as this is the place where all bacterias are getting to out body. This lymph nodes do guard us. So this is quite common (if the fatty tissue is thin) that lymph nodes are palpable. And it seems like same is in your case.
However, if this lymph nodes are bothering you, there is a simple way to have it checked. You should consult a surgeon or hematologist
to perform a biopsy
of lymph nodes to see why are they enlarged.
Hope this will help.