I'm getting angry because my friends are being pathetic.
What did they do to deserve your anger?
They always act like they don't need me around.
It's sad that you get such a message from them, but maybe they don't deserve such anger from you. Perhaps you are just misreading the situation, and they might just want to be more independent from you. It sounds like a frank conversation is in order.
I don't care. I'm never talking to them again.
Are you sure you'll be better off without having friends? I'm afraid that you'll get lonely without people to hang out with. At least try to make some new friends before dumping your old ones out of anger.