Please help, what do i do about this friend that bullies me and others?

Its the average bully. She want to feel superior, or maybe not superior, but accepted. So she disses on everyone else, including you, to make herself feel better. Its her low self esteem and even though she may act like your "friend" and be nice to you sometimes, she really isnt. She just bullies you because you are an easy target since you are "friends" and she knows you probably wont insult her back, because then you would look bad in front of your other friends, maybe. Dont let it bring you down. I understand this type of thing is hard, because it happenned to me once, but just hold on. If I were you I would just walk away. She is not your friend even though she likes to pretend. It is hard, because she would drag along some of your friends. But you cant be afraid of that, and you can hate her for that, but you are better off just without her. She may try to keep holding on to you and bothering you, she wouldnt want to loose the person she bullies to make her look better, duh. But just keep staying away from her and take her out of your life. After this, you will realize who your true friends are. Hope I helped :)