What Causes Enlarged Labia Minora?

i am 14, and my labia minoria are much bigger then my labia majoria, i have never had sex or anything like that. i am embaressed to wear bathing suits or look at mysel naked or wearking underwear. but they werent always like this, they have been this way since the summer. it may be a yeast infection but im obviously not sure at all. please help me!