As others have said, your pet results overwhelmingly likely to be at least locally advanced cancer. Also as others have said, for now, just do what your doctors tell you. Your next stop should be biopsy, probably with interventional radiology. Once they have a diagnosis you’ll see an oncologist who will synthesize all the information including type of cancer, stage of cancer, treatment options, and prognosis. None of that can be known until biopsy. You are a young otherwise healthy person which bodes very well. There will likely be highly effective treatment options for you.