How can i get bigger ?

i'm 14 and 129.8 pounds (or 59 kgs) I really want to have bigger s and i'm afraid they won't get much bigger coz my mum's arent that big. I've tried to gaining weight but its really hard even though im not that active. What can do to make them bigger? (and i don't mean fake ones or padding). Are there any specific foods or something?