I was 25 when diagnosed with HPV + tonsil / base of tongue cancer, so it can happen although its quite rare for our age.

My only symptom was a painless large hard lymph node that was moveable. The docs actually said that being movable was a good thing. You can search for my history but my neck was first checked out with an ultrasound and then an ultrasound guided core biopsy was taken which resulted in a diagnosis. As others have said, get a biopsy and hopefully get the good news that it is not cancerous. It can be hard when you are in a low risk group to get a diagnosis ehen you have something as it is dismissed by your doctors. Keep it up until you get answers. Good luck!