Talking Statistically, and theortetically, You are quite young to have that ORAL CANCER
. Still, if you do feel like having an ulceroproliferative growth, which is NON-Healing, present since more than 3 weeks, UNRESPONSIVE to any Treatment, FEELS NUMBNESS
, and GROWTH FEELS HARD BOARD like, then these may be initial signs of the disease. Otherwise, The chances seems very slim. you may be suffering more likely from Gums and Periodontal Problems along with either Leukoplakia
or like LICHEN PLANUS
You must definitely seek a dentist/ oral surgeon for the proper diagnosis and treatment.