The insignificance of my existance

Sometimes, I feel as though no one really acknowledges my presence. No body really goes out of their way to make me feel special. My life thus far has been in a dreamlike state, spending each day floating further and further into this black abyss which palletizes its quintessence around my existence. If I left this world, would it make a difference to anyone? I'm not saying this to be ignorant or naive, I'm just genuinely curious about whether I am cared for by those I love; known to those I crave attention from; understood by those who feel the same way; and significant to those who can make a difference.