Pain in throat, difficulty in swallowing and pain in lower part of tongue. Moderate pain in both ears. No node or swelling. Is it cancer?

See physician. You need to see your doctor or ear and nose specialist to make sure everything is ok or not your symptoms could be easily explained by many benign explanation specially you are still so young but if you are as smoker or chewer need to see a physician anyway in case of infection might need antibiotics.