MY SCHOOL LIFE IS HELL! EVERYONE AT SCHOOL HATES ME.!!!?

Ok, NONE of the popular girls in school like me, and they IMed me saying why do you sit at our table in homeroom? No one likes you, so stop sitting there, got it? and i answered her saying No thanks, ill sit wherever i damn please. :)" and this girl Tori who everyone loves always says " why do i have to sit next to her?" and i hate this girl tori, she has a bad attitude. No one talks to me in homeroom, i sit, and i stare at the clock for 20 minutes, while evryone is giving my dirty looks, and talking with their friends.I just want to cry sometimes. Online earlier, one of the popular girls IMed me calling me a B*****, and stuff like that. I responded, " Dont call me that, and in life you wont be respected because you swear too much." I have a few friends, but not close ones at all. Just friends, NO best friends whatsoever. :( The reason im upset is also becuase im a nice person, and i want people to realize that. In my old school ( a few months ago) I had many best friends, and i miss my old school so bad, but i want to go back, and oh, another one of the popular girls from school IMed me saying " Go build some house your not going to sell, and go back to wherever i came from. Now all of you know that the economy is tough right now, and my dad build houses, he couldnt sell the one im living in now, so we had to move into it. So i got really upset. I'm having trouble in school too. I have mostly all C's. During study hall i HAVE to get extra help, and if you get extra help, everyone calls you a retard, sped, dumb a**, and lots of other mean, cruel things that make me wanna cry. People stare at you as you walk out, and sweat is pouring down my face. I am not having any trouble at home, my parents are together, and i have a sister, a loving family. But my cat ran away, and people made fun of me that i had a picture of him and me in my locker.I cant take it anymore! i want to go to my old school, i want friends, i dont want anyone to hate me, i dont want to get extra help, i want my cat, and i miss my old bestfriends! im seeing one of them tomorrow at church, but still. I'm scared to go to school on Monday, knowing that the popular girls will probably not let me sit at the table. ( i have NO WHERE else to sit, because there is a guy table, and a girl table. Please Please help me! What do i do? If i tell a guidance cousler, she will talk to the other girls, and then they will hate me more because i snitched. I just watched the titanic so im also sad about that too lol. Im in 7th grade if that helps. Thank you so much guys! I love you all for answering!!! =]