Hypercondriac?

Hey, i'm 17 i have no history of cancer in the family, i have a slightly tight throat which has been like this for a couple years now, but i have no diffuculty breathing, swallowing or eating, i have no lumps on the throat or neck and i do have a cough which comes and goes periodically and i am prone to ear infections which has been the case for about 7/8 years, and i get occasional sore throats but take lozenges for it, nothing special and they go after a week or so, what is the chance that i have cancer of the throat, i'm quite worried about this asfter someone said in passing that i may have throat cancer ...