The good friend

Being told your a good friend. When all you feel is isolated from everyone around you. If I'm good friend why do you do things without me? Why treat me like I'm different from everyone, that anything I do should be treated as special and unusual when I know it's a good laugh for all of you. Why if I'm the good friend do you treat me like dirt? Because I'm easy to ignore? Because I will forgive you the second you let me down? Because I hate to know I'm the reason for you to be angry at me? If I'm such a good friend why do I feel like you hate me?