I want help!!.....plzz helm me!?

if it's just your face that is thin and not the rest of your body then i don't know what to tell you. but you might be under-nourished. you really need to try and get on some sort of balanced diet routine. eating healthy will put your body weight at a healthy level and will fill your face in. if you have other problems besides just the way you look then you should consult a doctor or a nutritionist to make sure you don't have anything else going on.