Lympg node same size for 2 years, what to do?

Hi, i remember the exact day the two lymph nodes popped up, i was attending my regular muay thai class, we was doing alot of kicking that night, i felt a very bad pain in the right side of my groin, i thought i had a small hernia, upon attending the doctors they told me it was a lymph node, It's been around 2 years now as it was october 2017, I've only just found out if a lymph node stays enlarged it could be lymphoma, so thats why im here to get your oppinions, i have no symptoms i feel great, just very very worried about this, i have one right next to it, one is 2cm or just over, second is just long and thin but 2cm, should i pursue this? Would lymphoma have grown alot by now? Should i wait until it gets bigger? I've seen around 7 doctors who all say its nothing to worry about, but surely without a biopsy they could be wrong? Like i said no symptoms what so ever, feel great.... im more worried about the possibility of a slow growing? But surely alot of growth would have happened over 2 years? Thanks