Zombie town

you are a ten year old kid playing with your friends, sorry to everyone who didn't have friends i feel the same, whatever so as your playing soccer the ball falls in to a forest and it's your turn to get it but as you start to pick it up you fall in to a weird, abandoned city.you hear your friends walking away but you can not follow because there is a big mountain in-between the city and your friends.as you start exploring you find a lot of zombies but there is a place to hide.what will you do??