Just Got A Native Tibetan Mastiff! HELLLLP!!!!?

i am scared of dogs, but i will die if i ever meet this one. why the hell would you want a dog like that? i would return to a place, so it can keep it safe, the city needs it more(lol)....... that is so scary oh my gosh. i would never get a dog like that, hence i would never get a dog or likewise. maybe