Sense of purpose.

I feel empty on the inside.Really empty.. i don't know why..is it because of friends? no...Is it because of family? No...is it because im hungy? no..I don't even know why i feel empty..all i know is that within me is a very hollow feeling that continues to linger within me despite efforts to keep it away. Everything i do seems to fail and i continually disappoint everyone with my actions..what can i do to get rid of this feeling? even my body seems to fail me..my sense of purpose have become distorted and gradually i began to lose the sight of the light and here i am typing away with no sense of purpose..i love my mom, my dad, my family, my friends but something seems to be missing. what is that unknown factor that keeps me from being joyful? for now i shall called that unknown factor "MISSING" to ease my sense of hollowness a bit by giving it a name. i wonder what happen to my "missing"? its just not there. Where oh where art thou "missing" ?