I had a bad experience when I sat in Junior High School, of course, my quiet character has been a problem to most of the people around me, actually my teachers and classmates. They didn't like a person who was too quiet like me. I was too weirdo. I didn't have any friends, and when there was a group to do a task, I didn't have a group. Just alone.
And this night, this experience emerged. I joined a general class, and because I didn't say anything, the teacher and the classmates didn't recognize my existence. I was exist, but at the same time I was not. Did it hurt me? Ya, I was so sad about that. But, then I think, why did I hope something which I didn't make an effort? This is the rule of life. I understand and I didn't feel sad anymore.
But I want to tell something too about the cruel fact about this, if you don't show them if you exist, and then you become nothing, and if you receive it, then it's okay. Nothing and no one can hurt you, except your own expectation. As Bo said, lower your expectation is the best.