I want to join the british army but i worried bout the medical?

hi im stuart im 21 i really want to join the british army but when i was 13 my father hit me in my left ear which i can still hear out of really but i want to know will this runing my chances of join the british army im in the middle of my join proseecs and i m really worried bout the medical thats can u help me many thanks i awlays wanted to be part of the best team in the world my grandfather was a solider and i just want to give back for everythink i had i really want this more than anythink