my sister that s 3 years old thinks i m so stupid. she never has patience for me when i say something. she says that it s because she expects more because she thinks she s knowledgeable and i should be learning from her. and that we didn t come from a stupid family so i have it in me. she know that she hurts me when she says that and she says it in front of her friends or to her friends so when i get mad and walk away she laughs. she says like you listen to music, what s that gonna give you in the long run? she says she has more patience for friends and stuff because she doesn t expect anything from them. what do i do? i tell her that it hurts my feelings but she doesn t care. she makes me so much more depressed than i already am like i just want to be gone. we live together but don t act like sisters, just roommates. please help me