Feeling ? What is the definition of feeling ? What kind feeling we always feels? Why must we have a feeling ?

Well i think all of us has a feeling. We were born with feeling. Even crazy peoples also have a feeling. But why peoples nowadays keep hurting or break the feeling? 

I want all human appreciate people's feeling . But nowadays people keep hurting feeling peoples  around them Like seriously. i hate to those who don't even know how to appreciate people's feeling. When we knows peoples around us never appreciate our feeling, of course we will feel down and disappointed. But well i'm used to it. I seriously not understand why my feeling always got hurt. Sometimes i feel peoples never understand my feeling even my family. And yes i will act like nothing is happen although I'm broken-heart man. This is the risk of being stronger, people will never know that you are in pain.