HOW CAN I STOP BEING SO @!#$ SHY???(sorry for the curse):)?

ok so i am soooooo shy i mean super shy around my family i just sit somewhere and stay there for the rest of the day until we leave and if im in school i feel like everyone looks at me and i blush constantly and if i go in school i get shaky and my hands get shaky and i want to cry but i cant and i never ever ever talk and im nervous just to post this ugh i hate it sooo bad.......... i hate it o and when im on school and people say stuff to me about me i just don't say anything and just let them say stuff..................for an example if were in cl and i need my pencil sharpened or it ran out of led and i need some i just dont do anything and i act like im doing my work until cl is over and i do it for homework..............how can i stop being shy??? please i need serious help here..:(one more thing the reason why im so shy is cause i have acne and blue and black hair and my family is either rich and they look at me wierd and snobby about or their druggies and thy just say stuff about it.......