Not Again !!!!

Why does it happen? When ever I am in a good mood, happy about my achievements or feeling great about myself, or looking forward for an appriciation.... people around me are sad, depressed or angry. While trying to console them, i have to compromise on my feelings. Sometimes delaying telling them the great news, sometimes totally keeping it to myself in the fear of rejection. So i ask again why do i have to face this? Dont my feelings have the same importance as other's? if they are then why dont they get the same credit which they should?