What am i supposed to do?

Hi, Im 14 years old, and i have been having problems with school, friends, depression and anxiety. Im not diagnosed with anything but i have been feeling like shit for about 4-5 years. I have been away from school for more then half a year and cant bring myself to go back, i have been warned now that if i dont do anything about it, i might be send to a foster family. I have tried talking to people but i cant handle being around other People, how can i fix my problems with this i need to know, can anybody please help me i dont know what to do!