Why is my friend such a sook?

I don't know how old you are but I had a similar thing in high school. Basically I would say that friendship is a two way street, she demands a lot from you but gives nothing in return. All I can say is slowly faze her out. She will cause rifts between you and your other friends and slowly but surely it will end up being just the two of you. She is jealous of your friendships and the fact you are comfortable around people. Remember people are judgmental and if they see you hanging around her they will think you are a b**** too. I say dump her, she will only drag you down. You will have to do this slowly as she will be angry and may want to fight you as she is aggressive. Hope this helps. Life is too short to waste on a**holes.