why do i care so much about what other people think?? What is wrong with me?? I have no friends and …

why do i care so much about what other people think?? What is wrong with me?? I have no friends and i live with my parents at age 20, in fact i nevr had any friends because everytime im around people i get so anxious i nevr talk at all. My life is useless, and i wish i wasnt such a bitch.