Swollen lymph nodes for almost 2 years. please answer?

Okay, so i am 15 years, female, i have had swollen lymph nodes for about a year now or i noticed 1 year ago. No pain, once in a while i get a sore throat(very rare) i feel perfectly fine! Full of energy, I have been doing some research on google, and i found i could get a cancer called lymphoma? well i was wondering whats wrong? my parents said i have had swollen nodes since i was small, we went to the doctor i told them how long i had them, or recently noticed them, and all he did was feel them, and say, Yes they are swollen. nothing else... okay?? very helpful.. so im curious could maybe my body is just built with enlarged nodes from the beggeing? i dont know if that is a stupid question, but i am concerned.