Mean Sisters...​. Any advice??

My sisters are very mean to me. I'm 18, and I have a 23 yr old sister and a 16 yr old sister, so I'm the middle child. Both my sisters always have something negative to say about me. They say I don't try in anything I do and always call me stupid. I know I'm not dumb, but I also know I'm not that smart. I have really bad anxiety and they know I don't like to do things by myself or want to get a job. They think I use my anxiety as an excuse for everything, but I don't. They don't know how I feel. I always try telling them that their words are hurtful, but they continue to pick on me. And I always try talking to them about my life but they won't listen to me. In the future I see myself disowning my sisters, family was never important to me anyways... I don't know what I should do in the meantime, while I have to put up with my cruel sisters, Any advice??