I know you are worried, but it could be any number of things going on. First, please go to your parents and tell them everything you have written here, all of it. Second, avoid all tobacco products! If you dont start you wont have to go thru the withdraw later of trying to quit. Ive lost half my lower jaw because I was foolish enough to smoke and had the
"it wont happen to me" mindset. By avoiding tobacco and alcohol, it will give your mouth a chance to heal. Lastly, do yourself a favor and avoid Dr Google. If you type enough info even a hangnail can show up looking like a deadly disease.
Hope its nothing serious!
PS... If you havent already had the Guardisil series of three vaccines, get them. By doing this you could be immune from ever developing
HPV+ oral cancer and several others too.