Basically you are being bullied, emotionally bullied, that is now considered a abuse. Why have a bully in your life and put up with abuse, your parents are ducking the issue. Maybe your sister is jealous of you, I don’t really know why you are being bullied. It is unacceptable. Narcissistic behaviour by him? You don’t need their approval, live your own life. Build up your own self esteem, be strong, surround yourself with people whose company you enjoy, Do not look for their approval or acceptance, you are great as you are, a beautiful caring person. You are on the cusp of living an independent life, an independent person, part of this involves breaking ties with family or old habits with family, painful at times I know. They seem intent on holding you back, don’t let them. Have a great life, don’t get put on as the victim by giving them power over you. It is time for you to start becoming your own parent, take back the power, nurture yourself. How do I know this, I had a very similar problem myself and needed lots and lots of support, which I got from wonderful friends. Initially the problem got worse, as my sister and brother tried to grab back power over me, now I have a wonderful partner after claiming back the power. If the behaviour returns at family occasions it looks odd and bizarre. My brother in law now can been quite nasty and controlling towards my sister and parents. I feel that is something they need to sort out themselves. I wish you all the love and luck in the world.. If possible get support, from college? I needed support, but I have come out the other side.