Why cant i make friends? *edited*?

You know the answer. It's because you are mean. You may think you're only mean to people who piss you off, but people may think it's unjustified. Maybe they think you get pissed off far too easily. In order to make friends, you can't be difficult to get along with. You and your sister can practice being less mean every day. When you have an urge to say/do something mean, ask yourself first whether you really want to go there. Good luck.