Your most likely to guess its about you.

I'm sick of all your unfairness, and I'm sick of all your pathetic lies. You think that everything you do is right, the good thing, and what everybody else wants. But to be honest dear, its not. I know I can be selfish and self-centred sometimes, I hate to break it to you, but you're the most impatient, pathetic, self-centred, unfair person I know. And it sure is about time you realised that. You have come between so many of my friendships, and it has hurt me so much. I'm not sure if you're going to read this, but I hope you do. You say that I'm your best friend and you love me. But have you realised how much you have hurt me? I get scared to tell you that I can't hang out with you, or if I'm sick cos you always get mad at me. Everything I do always seems to be wrong with you. You make me feel worthless/useless, and it hurts so badly. You say I always treat you like crap, but to be honest. I don't think I'm the one who needs to clean up they're attitude.