Longing

How do you write a feeling of such longing? Such longing that crushes as much as despairs? Longing should give me a sense of hope that it might one day be, but instead it fills my mind with doubt.
How does one make another feel your longing? Not for a touch or a kiss. Just to share the same feeling that grows inside your chest and clouds your mind. Just to share so you know you are not alone?
I long for another, but I am afraid there is none. I long for someone to share my life with. I long for something I cannot have because I am too scared to let anyone in.
I am scared that if I let someone in and they left or betrayed me, I would fall to pieces, never to put to rights again.  I protect myself, I am glass wrapped in paper.
Have you ever been hurt so bad that you’re so determined that you can’t let anyone in again for your own safety?
I know that I am the one who cannot let my longing heart reach solitude. What does this make me? Am I any better than the cutter who bleeds from their wrists just to feel something? Am I holding onto broken despair just so I can feel something? Or is my longing to feel that proves that I am only human?