Hello and welcome. Well, first off let me just say that I don't really consider myself an "expert" per say, but several of us have some experience under our belts since we've either been through a cancer diagnosis ourselves or have had a loved one who has.
So you've had these enlarged nodes for about 6 months and it started out as a sore throat? In my opinion, the nodes are reacting to an infection you had when your sore throat showed up. Sometimes lymph nodes don't shrink all the way back down and you may just have residual nodes.
There isn't a way that anyone can diagnose you via the internet and say for sure if you have a disease. You should be seen in person by your doctor and let him (or her) make that call. However, based on the description you gave, I wouldn't be too worried.