Why being "good"is bad?

Do you ever comes out in your mind that you're so good to your friends, family, your boyfriend or gilfriends and to other people that you forget to be good to yourself? I wonder if you have ever experiences it that despite of all the efforts and too good to be true. You find yourself being sad and abuse. You feel that you are not being compensated and only few makes an effort to thank you. However, despite of this, you don't focus on it and decides to go on with your life. But, despite of this, their were times you asked yourself you felt being left behind. They only recognize your goodness when you have something to give. When is goodness becomes bad?