Why am i feeling this?

I've been constantly feel that i'm alone, but i wonder why? I have friends, i have families, and i have someone to love.. But why do i still feel this pain inside of me? Why do i always feel the need to be loved? Why do i always feel so empty on the inside? I need to know.. I need to know what's been missing in my life right now. The constant feeling of being wanted and being yearned for. The sad emptiness inside of me never seems to be filled up with joy and laughter. Even when i smile, i still feel a pain of sadness within that joyous smile everyone sees. What am i missing? The pain inside is torturing and it's tearing me apart. Why do i feel so... So... So lost on the inside? Depression seems to be only thing that keeps me going yet killing me at the same time. Can i not be cured of this insanity? Will my nightmares one day stop haunting me? I guess only time will tell..