Im always alone. help? [ 20 characters]?

last year i was put in online homeschooling because of health issues. I only talk to friends occasionally through myspace, but thats about all. I live alone with my grandmother, im really hoping ill be healthy enough to go back this fall. but im extremely lonely, my grandma is strict and i cant go out and see friends, and going over to a friends house is not allowed either and they definately cant come here. i basically sit in my room all day doing work on the computer, i feel miserable. my grandma only has nasty things to say to me most of the time even though im the one who cooks all the meals, does the dishes, cleans the house, vacuums, schedules appointments, does the grocery shopping, and basically everything else. im starting to get depressed, i need a social life, badly. but im not allowed to have one, if i ask if i can go to a sleepover or something my grandma bawls me out and calls me a tramp and saying ill get d yada yada. idk what to do.. im 14 and female. i've come really close to cutting a few times but i always stopped myself. im afraid it will only get worse. what should i do?